Assertion `(A) :` In radioactive disintegrations, `._(2)He^(4)` nuclei can come out of the nucleus but lighter `._(2)H^(3)` cannot. Reason `(R) :` The

Assertion `(A) :` In radioactive disintegrations, `._(2)He^(4)` nuclei can come out of the nucleus but lighter `._(2)H^(3)` cannot. Reason `(R) :` The
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Assertion `(A) :` In radioactive disintegrations, `._(2)He^(4)` nuclei can come out of the nucleus but ... D. If both (A) and (R ) are incorrect.
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(3) two light nuclei combine to form a heavy nucleus Explanation: Nuclear fusion is the process of making a single heavy nucleus (part of an atom) from two lighter nuclei. The difference in mass between the products and reactants is manifested as the release of large amounts of energy. Fusion is the process that powers active or "main sequence" stars, or other high magnitude stars.

Description : (3) two light nuclei combine to form a heavy nucleus Explanation: Nuclear fusion is the process of making a single heavy nucleus (part of an atom) from two lighter nuclei. The difference in mass ... . Fusion is the process that powers active or "main sequence" stars, or other high magnitude stars.

Last Answer : Helium is added to the oxygen supply of deep sea divers because it is - (1) less poisonous than nitrogen (2) (2) Lighter than nitrogen (3) Readily miscible with oxygen (4) less soluble in blood than nitrogen at high pressure

In the disintegration of a radioactive element, `alpha` and `beta`-particles are evolved from the nucleus: `._(0)^(1)n to ._(1)^(1)H + ._(-1)^(0)e` +

Description : In the disintegration of a radioactive element, `alpha` and `beta`-particles are evolved from the nucleus: `._(0)^(1)n to ._(1)^(1)H + ._(-1)^(0)e` +

Last Answer : In the disintegration of a radioactive element, `alpha` and `beta`-particles are evolved from ... of `gamma`-radiations may yield nuclear isomer

In the disintegration of a radioactive element, `alpha`- and `beta`-particles are evolved from the nucleus. `._(0)n^(1) rarr ._(1)H^(1) + ._(-1)e^(0)

Description : In the disintegration of a radioactive element, `alpha`- and `beta`-particles are evolved from the nucleus. `._(0)n^(1) rarr ._(1)H^(1) + ._(-1)e^(0)

Last Answer : In the disintegration of a radioactive element, `alpha`- and `beta`-particles are evolved from the nucleus. `._(0 ... C. `2 alpha, 2 beta` D. `n beta`

In the disintegration of a radioactive element, `alpha`- and `beta`-particles are evolved from the nucleus. `._(0)n^(1) rarr ._(1)H^(1) + ._(-1)e^(0)

Description : In the disintegration of a radioactive element, `alpha`- and `beta`-particles are evolved from the nucleus. `._(0)n^(1) rarr ._(1)H^(1) + ._(-1)e^(0)

Last Answer : In the disintegration of a radioactive element, `alpha`- and `beta`-particles are evolved from the ... C. decreases by 2 unit D. remains unaffected

In the disintegration of a radioactive element, `alpha`- and `beta`-particles are evolved from the nucleus. `._(0)n^(1) rarr ._(1)H^(1) + ._(-1)e^(0)

Description : In the disintegration of a radioactive element, `alpha`- and `beta`-particles are evolved from the nucleus. `._(0)n^(1) rarr ._(1)H^(1) + ._(-1)e^(0)

Last Answer : In the disintegration of a radioactive element, `alpha`- and `beta`-particles are evolved from the nucleus. `._(0) ... in A. IIA B. IA C. IIB D. IVB

In the disintegration of a radioactive element, `alpha`- and `beta`-particles are evolved from the nucleus. `._(0)n^(1) rarr ._(1)H^(1) + ._(-1)e^(0)

Description : In the disintegration of a radioactive element, `alpha`- and `beta`-particles are evolved from the nucleus. `._(0)n^(1) rarr ._(1)H^(1) + ._(-1)e^(0)

Last Answer : In the disintegration of a radioactive element, `alpha`- and `beta`-particles are evolved from the nucleus. ... , beta, beta` D. `beta, gamma, alpha`

Radioactive substance has a constant activity of 2000 disintegrations per minute. The material is separated into two fractions, one of which has an in

Description : Radioactive substance has a constant activity of 2000 disintegrations per minute. The material is separated into two fractions, one of which has an in

Last Answer : Radioactive substance has a constant activity of 2000 disintegrations per minute. The material is separated into two ... 1500 B. 1000 C. 1250 D. 2000

Which of the following inert gas is available only as a product in the radioactive disintegrations ?

Description : Which of the following inert gas is available only as a product in the radioactive disintegrations ?

Last Answer : Which of the following inert gas is available only as a product in the radioactive disintegrations ? A. He B. Ar C. Rn D. Kr

If a U-238 nucleus splits into two identical parts, the two nuclei so produced will be _____. A. Radioactive B. Stable C. Isotopes D. Isobars

Description : If a U-238 nucleus splits into two identical parts, the two nuclei so produced will be _____. A. Radioactive B. Stable C. Isotopes D. Isobars

Last Answer : ANSWER: A

Assertion : In a radioactive disintegration, an electron is emitted by the nucleus. Reason : Electrons are always present inside the nucleus.

Description : Assertion : In a radioactive disintegration, an electron is emitted by the nucleus. Reason : Electrons are always present inside the nucleus.

Last Answer : Assertion : In a radioactive disintegration, an electron is emitted by the nucleus. Reason : Electrons are ... both (A) and (R ) are incorrect.

Assertion (A) : Half life of a radioactive isotope is the time required to decrease its mass number by half Reason (R ) : Half life of radioactive iso

Description : Assertion (A) : Half life of a radioactive isotope is the time required to decrease its mass number by half Reason (R ) : Half life of radioactive iso

Last Answer : Assertion (A) : Half life of a radioactive isotope is the time required to decrease its mass number by half ... . If both (A) and (R ) are incorrect.

Assertion (A) : The average life of a radioactive element is infinity Reason (R ) : As a radioactive element disinegrates, more of it is formed in nat

Description : Assertion (A) : The average life of a radioactive element is infinity Reason (R ) : As a radioactive element disinegrates, more of it is formed in nat

Last Answer : Assertion (A) : The average life of a radioactive element is infinity Reason (R ) : As a radioactive element ... . If both (A) and (R ) are incorrect.

Assertion (A) `:` Replication and transcription occur in the nucleus but translation occurs in the cytoplasm. Reason (R ) `:` m-RNA is transferred fro

Description : Assertion (A) `:` Replication and transcription occur in the nucleus but translation occurs in the cytoplasm. Reason (R ) `:` m-RNA is transferred fro

Last Answer : Assertion (A) `:` Replication and transcription occur in the nucleus but translation occurs in the ... D. If both assertion and reason are false.

Assertion `(A):` `._(92)U^(238) (IIIB)overset(-alpha)rarrAoverset(-alpha)rarrB overset(-beta)rarrC` Reason `(R):` Element `B` will be of `II A ` group

Description : Assertion `(A):` `._(92)U^(238) (IIIB)overset(-alpha)rarrAoverset(-alpha)rarrB overset(-beta)rarrC` Reason `(R):` Element `B` will be of `II A ` group

Last Answer : Assertion `(A):` `._(92)U^(238) (IIIB)overset(-alpha)rarrAoverset(-alpha)rarrB overset(-beta)rarrC` Reason ... D. If both (A) and (R ) are incorrect.

Assertion(A): In the fermentation process of molasses, along with yeast `(NH_(4))_(2)SO_(4), (NH_(4))_(3) PO_(4)` is added Reason (R): `(NH_(4))_(3)PO

Description : Assertion(A): In the fermentation process of molasses, along with yeast `(NH_(4))_(2)SO_(4), (NH_(4))_(3) PO_(4)` is added Reason (R): `(NH_(4))_(3)PO

Last Answer : Assertion(A): In the fermentation process of molasses, along with yeast `(NH_(4))_(2)SO_(4), (NH_(4))_ ... but R is false D. A is false but R is true

Assertion (A): Money in our pocket cannot buy us all the things we need to live. Reason (R): Money cannot buy us a pollution free environment, unadulterated medicines and pollution free environment etc. a) Both A and R are true and R is the correct explanation of A. b) Both A and R are true and R is the not correct explanation of A. c) A is correct but R is wrong. d) A is wrong but R is correct.

Description : Assertion (A): Money in our pocket cannot buy us all the things we need to live. Reason (R): Money cannot buy us a pollution free environment, unadulterated medicines and pollution free environment etc. a) Both A and ... of A. c) A is correct but R is wrong. d) A is wrong but R is correct.

Last Answer : a) Both A and R are true and R is the correct explanation of A.

Pick out the wrong statement. (A) The disintegration rate of a radioactive substance cannot be increased by heating it (B) Electrons have negligible mass and unit negative change (C) Deuterium atom has one proton and two neutrons in its nucleus (D) Cadmium is capable of absorbing neutrons

Description : Pick out the wrong statement. (A) The disintegration rate of a radioactive substance cannot be increased by heating it (B) Electrons have negligible mass and unit negative change (C) Deuterium atom has one proton and two neutrons in its nucleus (D) Cadmium is capable of absorbing neutrons

Last Answer : (C) Deuterium atom has one proton and two neutrons in its nucleus

Assertion (A): UV radiation causes photodissociation of ozone into `O_(2)` and O, thus causing damage to the stratospheric change. Reason (R): Ozone h

Description : Assertion (A): UV radiation causes photodissociation of ozone into `O_(2)` and O, thus causing damage to the stratospheric change. Reason (R): Ozone h

Last Answer : Assertion (A): UV radiation causes photodissociation of ozone into `O_(2)` and O, thus causing damage ... true but reason is wrong D. Both are wrong

Which of the following nuclei are doubly magic? a)`._(92)U^(238)` b)`._(2)He^(4)` c)`._(8)O^(16)` d)`._(82)Pb^(208)`

Description : Which of the following nuclei are doubly magic? a)`._(92)U^(238)` b)`._(2)He^(4)` c)`._(8)O^(16)` d)`._(82)Pb^(208)`

Last Answer : Which of the following nuclei are doubly magic? a)`._(92)U^(238)` b)`._(2)He^(4)` c)`._(8)O^(16)` d)`._( ... O` C. `._(82)^(208)Pb` D. `._(92)^(238)U`

Assertion (A) Sound waves are not electromagnetic waves. Reason (R) Sound waves cannot propagate in vacuum.

Description : Assertion (A) Sound waves are not electromagnetic waves. Reason (R) Sound waves cannot propagate in vacuum.

Last Answer : Ans:(a)

Let `T` be the mean life of a radioactive sample. `75%` of the active nuclei present in th sample initially will deacy in time

Description : Let `T` be the mean life of a radioactive sample. `75%` of the active nuclei present in th sample initially will deacy in time

Last Answer : Let `T` be the mean life of a radioactive sample. `75%` of the active nuclei present in th sample initially will ... ` C. 4T D. `2 (log_(e) 2) T`

The time required for half of the __________ of a radioactive isotope to decay is called its half life. (A) Nuclei (B) Electrons

Description : The time required for half of the __________ of a radioactive isotope to decay is called its half life. (A) Nuclei (B) Electrons

Last Answer : (A) Nuclei

In the radioactive change, `._(Z)^(A)P to ._(Z + 1)^(A)Q to ._(Z - 1)^(A - 4)R to ._(Z - 1)^(A - 4)S` The radioactive emitted in sequence are:

Description : In the radioactive change, `._(Z)^(A)P to ._(Z + 1)^(A)Q to ._(Z - 1)^(A - 4)R to ._(Z - 1)^(A - 4)S` The radioactive emitted in sequence are:

Last Answer : In the radioactive change, `._(Z)^(A)P to ._(Z + 1)^(A)Q to ._(Z - 1)^(A - 4)R to ._ ... alpha, gamma` C. `gamma, alpha, beta` D. `beta, gamma, alpha`

One curie is equal to: w) the square root of the binding energy x) the energy of an alpha-particle y) 3.7 x 1010 disintegrations per second z) mc2

Description : One curie is equal to: w) the square root of the binding energy x) the energy of an alpha-particle y) 3.7 x 1010 disintegrations per second z) mc2

Last Answer : ANSWER: Y -- 3.7 x 1010 DISINTEGRATIONS PER SECOND

Assertion (A): Mohan is a shopkeeper who pays his taxes on time. He has employed two workers Raghu and Rakesh in his shop. He pays them well but none of the workers get paid leaves in a year. Reason (R): Rakesh and Raghu are employed in an unorganized sector. (a) Both A & R are true and R is the correct explanation of A (b) Both A & R are true but R is not the correct explanation of A. (c) A is true but R is false. (d) Both A & R are false.

Description : Assertion (A): Mohan is a shopkeeper who pays his taxes on time. He has employed two workers Raghu and Rakesh in his shop. He pays them well but none of the workers get paid leaves in a year. Reason (R): Rakesh ... correct explanation of A. (c) A is true but R is false. (d) Both A & R are false.

Last Answer : (a) Both A & R are true and R is the correct explanation of A

Assertion (A): The coin when flipped next time will come up tails. Reason (R): Because the coin was flipped five times in a row, and each time it came up heads. Choose the correct answer from below: (A) Both (A) and (R) are true, and (R) is the correct explanation of (A). (B) Both (A) and (R) are false, and (R) is the correct explanation of (A). (C) (A) is doubtful, (R) is true, and (R) is not the correct explanation of (A). (D) (A) is doubtful, (R) is false, and (R) is the correct explanation of (A).

Description : Assertion (A): The coin when flipped next time will come up tails. Reason (R): Because the coin was flipped five times in a row, and each time it came up heads. Choose the correct answer from below: (A) Both (A ... A). (D) (A) is doubtful, (R) is false, and (R) is the correct explanation of (A).

Last Answer : (C) (A) is doubtful, (R) is true, and (R) is not the correct explanation of (A).

If a U-238 nucleus splits into two identical parts, how will the two nuclei be so produced? -Do You Know?

Description : If a U-238 nucleus splits into two identical parts, how will the two nuclei be so produced? -Do You Know?

Last Answer : answer:

Choose the incorrect statement from the following: (a) The nuclear becomes weak if the nucleus contains too many protons compared to the number of neutrons (b) The nuclear force becomes weak if the nucleus contains too many neutrons compared to the number of protons (c) Nuclei with atomic number greater than 82 show a tendency to disintegrate (d) The nuclear force becomes very strong if the nucleus contains a large number of nucleons.

Description : Choose the incorrect statement from the following: (a) The nuclear becomes weak if the nucleus contains too many protons compared to the number of neutrons (b) The nuclear force becomes weak if the ... (d) The nuclear force becomes very strong if the nucleus contains a large number of nucleons.

Last Answer : Ans:(d)

The nuclear reaction in which a heavy nucleus splits into two nuclei of nearly equal mass is called - (1) Nuclear fusion (2) Nuclear fission (3) Nuclear reaction (4) Fast breeding

Description : The nuclear reaction in which a heavy nucleus splits into two nuclei of nearly equal mass is called - (1) Nuclear fusion (2) Nuclear fission (3) Nuclear reaction (4) Fast breeding

Last Answer : (2) Nuclear fission Explanation: Nuclear fission is a process used to create energy. It is when an atom splits apart into smaller atoms. The process gives off a lot of energy, and is used in nuclear weapons and nuclear reactors.

The nuclear reaction in which a heavy nucleus splits into two nuclei of nearly equal mass is called - (1) Nuclear fusion (2) Nuclear fission (3) Nuclear reaction (4) Fast breeding

Description : The nuclear reaction in which a heavy nucleus splits into two nuclei of nearly equal mass is called - (1) Nuclear fusion (2) Nuclear fission (3) Nuclear reaction (4) Fast breeding

Last Answer : (2) Nuclear fission Explanation: Nuclear fission is a process used to create energy. It is when an atom splits apart into smaller atoms. The process gives off a lot of energy, and is used in nuclear weapons and nuclear reactors.

A heavy nucleus breaking up into smaller nuclei of almost equal size is called?

Description : A heavy nucleus breaking up into smaller nuclei of almost equal size is called?

Last Answer : Fission

If a U-238 nucleus splits into two identical parts, how will the two nuclei be so produced?

Description : If a U-238 nucleus splits into two identical parts, how will the two nuclei be so produced?

Last Answer : Stable

The sum of masses of two nuclei produced in nuclear fission compared to the mass of original nucleus is (A) Less (B) More (C) Same (D) Much more

Description : The sum of masses of two nuclei produced in nuclear fission compared to the mass of original nucleus is (A) Less (B) More (C) Same (D) Much more

Last Answer : (A) Less

The process of splitting a heavy nucleus into two medium sized nuclei along with release of neutrons is called

Description : The process of splitting a heavy nucleus into two medium sized nuclei along with release of neutrons is called

Last Answer : nuclear fission.

In a fission nuclear reaction , a heavy nucleus breaks up into smaller nuclei whereas in another nuclear reaction two or more than two possibly nuclei are fused to form a heavy nucleus This nuclear reaction is called ? A. Chemical Reaction B. Nuclear reaction C. Fission nuclear reaction D. Fusion nuclear reaction (Answer) E. None of these

Description : In a fission nuclear reaction , a heavy nucleus breaks up into smaller nuclei whereas in another nuclear reaction two or more than two possibly nuclei are fused to form a heavy nucleus This nuclear ... reaction C. Fission nuclear reaction D. Fusion nuclear reaction (Answer) E. None of these

Last Answer : D. Fusion nuclear reaction (Answer)

Giardia trophozoites contains B A. One nucleus B. Two nuclei C. Three nuclei D. Four nuclei

Description : Giardia trophozoites contains B A. One nucleus B. Two nuclei C. Three nuclei D. Four nuclei

Last Answer : Two nuclei

Double fertilisation is fusion of (a) two eggs (b) two eggs and polar nuclei with pollen nuclei (c) one male gamete with egg and other with synergid (d) one male gamete with egg and other with secondary nucleus.

Description : Double fertilisation is fusion of (a) two eggs (b) two eggs and polar nuclei with pollen nuclei (c) one male gamete with egg and other with synergid (d) one male gamete with egg and other with secondary nucleus.

Last Answer : (d) one male gamete with egg and other with secondary nucleus.

What is the fate of the male gametes discharged in the synergid? (a) One fuses with the egg and other fuses with central cell nuclei. (b) One fuses with the egg, other(s) degenerates in the synergid. (c) All fuse with the egg. (d) One fuses with the egg, other(s) fuse(s) with synergid nucleus.

Description : What is the fate of the male gametes discharged in the synergid? (a) One fuses with the egg and other fuses with central cell nuclei. (b) One fuses with the egg, other(s) degenerates in the synergid. (c) All fuse with the egg. (d) One fuses with the egg, other(s) fuse(s) with synergid nucleus.

Last Answer : (a) One fuses with the egg and other fuses with central cell nuclei.

When embryosac receives two or more than two pollen tubes the sperm nucleus fusing with the egg nucleus may be derived from one pollen tube and one fusing with the polar nuclei may be derived from other pollen tube, the phenomenon is termed as

Description : When embryosac receives two or more than two pollen tubes the sperm nucleus fusing with the egg nucleus may be derived from one pollen tube and one fusing with the polar nuclei may be derived from other pollen tube, the phenomenon is termed as

Last Answer : When embryosac receives two or more than two pollen tubes the sperm nucleus fusing with the egg nucleus may be derived from one pollen tube and one fusing with the polar nuclei may be derived from other pollen tube, the phenomenon is termed as – Heterofertilization

A nuclear reaction in which small nuclei combine to produce a larger nucleus is known as:

Description : A nuclear reaction in which small nuclei combine to produce a larger nucleus is known as:

Last Answer : ANSWER: FUSION or NUCLEAR FUSION

In Rutherford's experiment involving the deflection of alpha particles by atomic nuclei, the fact that some of the alpha particles bombarding the thin gold foil were back-scattered, led to one of the following conclusions. It was concluded that: w) the charge of an electron is negative x) the nucleus of a gold atom carries all its charge y) most of the mass of a gold atom is in its nucleus z) the nucleus of a gold atom occupies nearly the entire space of the atom

Description : In Rutherford's experiment involving the deflection of alpha particles by atomic nuclei, the fact that some of the alpha particles bombarding the thin gold foil were back-scattered, led to one of the ... its nucleus z) the nucleus of a gold atom occupies nearly the entire space of the atom

Last Answer : ANSWER: Y -- MOST OF THE MASS OF A GOLD ATOM IS IN ITS NUCLEUS

The process of nuclear reorganization in protozoa in which the nucleus divides, each half undergoes a maturation, and the tw persisting functional nuclei reunite is known as: a) autogamy b) autolysis c) autoregression d) autotomy

Description : The process of nuclear reorganization in protozoa in which the nucleus divides, each half undergoes a maturation, and the tw persisting functional nuclei reunite is known as: a) autogamy b) autolysis c) autoregression d) autotomy

Last Answer : ANSWER: A -- Autogamy

Which one of the following takes place during a nuclear fusion? (1) a heavy nucleus bombarded by neutrons breaks up (2) a heavy nucleus breaks up spontaneously (3) two light nuclei combine to form a heavy nucleus (4) a light nucleus breaks up spontaneously

Description : Which one of the following takes place during a nuclear fusion? (1) a heavy nucleus bombarded by neutrons breaks up (2) a heavy nucleus breaks up spontaneously (3) two light nuclei combine to form a heavy nucleus (4) a light nucleus breaks up spontaneously

Last Answer : two light nuclei combine to form a heavy nucleus

Assertion : Lymphocyte are the largest corpuscles. Reason : Nucleus of lymphocyte is large and kidney shaped .

Description : Assertion : Lymphocyte are the largest corpuscles. Reason : Nucleus of lymphocyte is large and kidney shaped .

Last Answer : Assertion : Lymphocyte are the largest corpuscles. Reason : Nucleus of lymphocyte is large and kidney ... D. If both Assertion & Reason are false.

Assertion : The nucleus of sperm fuses with the nucleus of ovum , before the formation of ootid . Reason : Diploid nuclear status of organism is essen

Description : Assertion : The nucleus of sperm fuses with the nucleus of ovum , before the formation of ootid . Reason : Diploid nuclear status of organism is essen

Last Answer : Assertion : The nucleus of sperm fuses with the nucleus of ovum , before the formation of ootid . ... . D. If both Assertion & Reason are False.

Assertion : Lymphocyte are the largest corpuscles. Reason : Nucleus of lymphocyte is large and kidney shaped .

Description : Assertion : Lymphocyte are the largest corpuscles. Reason : Nucleus of lymphocyte is large and kidney shaped .

Last Answer : Assertion : Lymphocyte are the largest corpuscles. Reason : Nucleus of lymphocyte is large and kidney ... D. If both Assertion & Reason are false.

Assertion: Nucleus controls the metabolic activitie of cytoplasm. Reason: Nucleus synthesizes enzymes and send them to cytoplasm to control the activi

Description : Assertion: Nucleus controls the metabolic activitie of cytoplasm. Reason: Nucleus synthesizes enzymes and send them to cytoplasm to control the activi

Last Answer : Assertion: Nucleus controls the metabolic activitie of cytoplasm. Reason: Nucleus synthesizes enzymes and ... If both Assertion & Reason are false.

Assertion :- Oxidation number of Cr in `Cr(CO)_(6)` is zero. Reason :- Cr is a metal.

Description : Assertion :- Oxidation number of Cr in `Cr(CO)_(6)` is zero. Reason :- Cr is a metal.

Last Answer : Assertion :- Oxidation number of Cr in `Cr(CO)_(6)` is zero. Reason :- Cr is a metal. A. ... Reason is False. D. If both Assertion & Reason are False.

Assertion :- Oxidation number of `Ni` in `[Ni(CO)_(4)]` is zero. ltbr. Reason :- Nickel is bonded to neutral ligand, carbonyl.

Description : Assertion :- Oxidation number of `Ni` in `[Ni(CO)_(4)]` is zero. ltbr. Reason :- Nickel is bonded to neutral ligand, carbonyl.

Last Answer : Assertion :- Oxidation number of `Ni` in `[Ni(CO)_(4)]` is zero. ltbr. Reason :- Nickel is ... is False. D. If both Assertion & Reason are False.

Assertion : Nickel can be purified by Mond process. Reason : `Ni(CO)_(4)` is a volatile compound which deomposed at `460K` to give pure `Ni`.

Description : Assertion : Nickel can be purified by Mond process. Reason : `Ni(CO)_(4)` is a volatile compound which deomposed at `460K` to give pure `Ni`.

Last Answer : Assertion : Nickel can be purified by Mond process. Reason : `Ni(CO)_(4)` is a volatile compound which deomposed at `460K` to give pure `Ni`.