Description : When a bar magnet is cut into two equal halves, the pole strength of each piece (1) becomes double (2) becomes half (3) becomes zero (4) remains the same
Last Answer : (4) remains the same Explanation: The poles remains same whether the magnet is cut into two equal half or more and also pole strength remains same but magnetic moment reduces due to decrease in the length of ... is called north pole (N-poled of the magnet and the other end the south pole (S-pole).
Description : When a helical spring is cut into two halves, the stiffness of each half spring will be, (A) Same as original spring (B) Double of original spring (C) Half of original spring (D) One fourth of original spring
Last Answer : (B) Double of original spring
Description : A wire of uniform area of cross-section A length L and resistance R is cut into two parts. Resistivity of each part a. remains the same b. is doubled c. is halved d. becomes zero
Last Answer : a. remains the same
Description : A spherical ball is divided into two equal halves. If the curved surface area of each half is 56.57 cm?, find the volume of the spherical ball.11531/cylinder-radius-halved-and-height-doubled-then-find-volume-with-respect-original-volume -Maths 9th
Last Answer : since curved surface of half of the spherical ball = 56.57 cm2 ∴ 2πr2 = 56.57 ⇒ r2 = 56.57 / 2 × 3.14 = 9 ⇒ r = 3 cm Now, volume of spherical ball = 4 / 3 πr3 = 4 / 3 × 3.14 × 3 × 3 × 3 = 113.04 cm3
Description : If the length of a cable is doubled, its capacitance (a) becomes one-fourth (b) becomes one-half (c) becomes double (d) remains unchanged
Last Answer : (c) becomes double
Description : With the increase of pressure, the boiling point of any substance - (1) Increases (2) Decreases (3) Remains Same (4) Becomes zero
Last Answer : (1) Increases Explanation: The temperature stays the same until all the liquid has vaporized. As the temperature of a liquid rises, the pressure of escaping vapor also rises, and at the boiling point ... vapor is equal to that exerted on the liquid by the surrounding air, causing bubbles to form.
Description : With the increase of pressure, the boiling point of any substance – (1) Increases (2) Decreases (3) Remains Same (4) Becomes zero
Description : How will we find out the north pole and south pole of a bar magnet with no markings to indicate poles?
Last Answer : If you roughly know where North is, tie the bar magnet to a piece of thin string so it balances horizontally and let it dangle. Once it stops spinning and waving about, one end should point North. Mark this end as with an N for north.
Description : If a bar magnet, tied in the middle with a thread, were suspended at the north pole of the earth, it would take (a) a horizontal position (b) a nearly vertical position with its north pole pointing downward (c) a vertical position with its south pole pointing downward (d) a slanting position
Last Answer : Ans:(b)
Description : Weight of a person at a height of 2R from the centre of the earth, where R is the radius of the earth- (1) remains same (2) becomes half (3) becomes twice (4) becomes one-fourth
Last Answer : (4) becomes one-fourth Explanation: The gravitational force is proportional to 1/R2, where R is the distance from the centre of the Earth. So at a height of 2R from the centre of the earth, the corresponding weight would be one-fourth of the original weight.
Description : When a piece of iron rod is brought near a permanent magnet for a while it becomes magnitised by?
Last Answer : Need answer
Description : The pole faces of U-shaped magnet in a moving coil galvanometer are made concave to a) decrease the strength of magnetic field b) create a non-uniform magnetic field c) make the magnetic field radial d) All of these
Last Answer : c) make the magnetic field radial
Description : A sphere is cut into two equal halves and both the halves are painted from all the sides. The radius of the sphere is r unit and the -Maths 9th
Last Answer : answer:
Description : Which of the following is TRUE of a sample of gas at a constant temperature when the pressure is doubled? w)the volume doubles x)the volume halves y)the volume remains the same
Last Answer : ANSWER: X -- THE VOLUME HALVES
Description : When water freezes its density – (1) Decreases (2) Becomes Zero (3) Remains constant (4) Increases
Last Answer : (1) Decreases Explanation: Water at ordinary temperatures contracts and in-creases in density as it is cooled, like most substances. But at about 4°C it reaches a maximum density and then decreases in density as it approaches the freezing point. This is referred to as anomalous property of water.
Description : By increasing the current, the drift velocity A. decreases B. increases C. remains constant D. becomes zero
Last Answer : remains constant
Description : As the ball falls towards the ground, its velocity A. increases B. decreases C. remains constant D. becomes zero
Last Answer : increases
Description : When water freezes its density (1) Decreases (2) Becomes Zero (3) Remains constant (4) Increases
Last Answer : Decreases
Description : A rectangular magnet of magnetic moment M is cut into two piece of same length, the magnetic moment of each piece will be
Last Answer : A rectangular magnet of magnetic moment M is cut into two piece of same length, the magnetic moment of each piece will be M/2.
Description : Ten coulombs of positive charge are placed on an irregularly-shaped, solid piece of copper. Once the charge has stopped moving, the electric field inside the copper is: w) zero x) changes as one ... squared y) becomes smaller as you approach the center z) becomes larger as you approach the center
Last Answer : ANSWER: W -- ZERO
Description : The introduction of interpoles in between the main pole improves the performance of d.c. machines, because (A) The interpole produces additional flux to augment the developed torque. (B) The flux waveform is ... armature is removed. (D) A counter e.m.f. is induced in the coil undergoing commutation.
Last Answer : Ans: D Counter e.m.f is produced, it neutralizes the reactive emf.
Description : If a bar magnet is cut length wise into 3 parts, what will the total number of poles be? -General Knowledge
Last Answer : The answer is '6'
Description : If a bar magnet is cut length wise into 3 parts, what will the total number of poles be?
Last Answer : 6
Description : An object of mass m and velocity v has kinetic energy= 200J. Find the new kinetic energy if the mass of the object becomes double and velocity still remains the same? -Physics 9th
Last Answer : let the k.e. in first case be x x = 1/2*m*v^2=200j in second case let the kinetic energy be x' v'=v m'=2m x'= 1/2*2m*v^2 x'= 2(1/2*m*v^2) x'=2(x) x'=2*200j x'=400j
Description : A close –coiled helical spring is cut into two equal parts. The stiffness of the resulting springs will be (a) same (b) double (c) half (d) One-fourth
Last Answer : (b) double
Description : If the stress produced by a prismatic bar is equal to the working stress, the area of the crosssection of the prismatic bar, becomes (A) Zero (B) Infinite (C) Maximum (D) Minimum
Last Answer : (B) Infinite
Description : The south pole of the earth’s magnet is near the geographical ________. (1) south (2) east (3) west (4) north
Last Answer : (4) north Explanation: The South Pole of the Earth's magnet is in the geographical North because it attracts the North Pole of the suspended magnet and vice versa. Thus, there is a magnetic S-pole near the geographical North, and a magnetic Npole near the geographical South
Description : Magnetic lines of force have all but one of the following characteristics. The one that they DO NOT have is: w) they go from the South-pole to the North-pole of a magnet outside of the magnet ... most concentrated at the poles of a magnet y) they pass through copper z) they never cross one another
Last Answer : ANSWER: W -- THEY GO FROM THE SOUTH-POLE TO THE NORTH-POLE OF THE M AGNET
Description : Magnetism at the centre of a bar magnet is - (1) minimum (2) maximum (3) zero (4) minimum or maximum
Last Answer : (3) zero Explanation: The field at the center is not zero, but weak. At the exact center of a magnet the field lines are parallel (straight lines if we draw it). Anywhere else they are slightly divergent.
Description : If the number of address bits in a memory is reduced by 2 and the addressability is doubled, the size of the memory (i.e., the number of bits stored in the memory) a. doubles b. remains unchanged c. halves d. increases by 2^(address bits)/addressability
Last Answer : c. halves
Description : A piece of wire of resistance 4 ohm s is bent through `180^(@)` at its mid point and the two halves are twisted together, then the resistance is
Last Answer : A piece of wire of resistance 4 ohm s is bent through `180^(@)` at its mid point and the two halves ... `8Omega` B. `1Omega` C. `2Omega` D. `5Omega`
Description : .If we narrow the distance between two slits in Young’s experiment the fringes width __________. A. Increases B. Decreases C. Remains same D. becomes zero
Last Answer : B. Decreases
Description : As we go from Equator to North pole the value of `S, the acceleration due to gravity (1) remains the same (2) decreases (3) increases (4) None of the above
Last Answer : (3) increases Explanation: The acceleration due to gravity of earth is the rate of increase of velocity of a body falling freely towards the earth. At a given place, the value of acceleration due to gravity ... out at the equator. The value of 'g' is minimum at the equator and maximum at the poles.
Description : As we go from Equator to North pole the value of ‘g’, the acceleration due to gravity (1) remains the same (2) decreases (3) increases (4) None of the above
Description : By accelerating the magnet inside the coil, the current in it A. increases B. decreases C. remains constant D. reverses
Description : When a piece of iron is rubbed with a magnet it acquires magnetism ' What kind of change is this and why ?
Last Answer : When a piece of iron is rubbed by a magnet, it acquires magnetism ' is a physical or positional change. This is because when rubbed by a magnet, no other substance is formed from iron. Again , when a piece of magnetized iron is heated, it loses its magnetism and is converted into ordinary iron.
Description : A potato tuber has been cut into two halves. A few drops of iodine solution are placed on the cut surface of one of the halves. What colour change will be noticed? (1) From brown to blue-black (2) From brown to orange-red (3) From blue to pink (4) From pink to blue-green
Last Answer : (1) From brown to blueblack Explanation: Any form of starch (carbohydrate) turns blue-black when iodine solution is applied to it. This is because starch is composed of polymers of ... already mentioned. The complex of iodine stuck inside the amylose coil produces a characteristic blueblack colour.
Description : potato tuber has been cut into two halves. A few drops of iodine solution are placed on the cut surface of one of the halves. What colour change will be noticed? (1) From brown to blue-black (2) From brown to orange-red (3) From blue to pink (4) From pink to blue-green
Last Answer : (1) From brown to blueblack Explanation: The Iodine test is used to test for the presence of starch. Iodine solution — iodine dissolved in an aqueous solution of potassium iodide — reacts with the starch producing a purple black colour.
Description : A potato tuber has been cut into two halves. A few drops of iodine solution are placed on the cut surface of one of the halves. What colour change will be noticed? (1) From brown to blue–black (2) From brown to orange–red (3) From blue to pink (4) From pink to blue–green
Last Answer : From brown to blue–black
Last Answer : From brown to blue-black
Description : The piece of a brick cut along the centre of width in such a way that its length is equal to that of full brick, is called (A) Half brick (B) Queen closer (C) King closer (D) Bevelled closer
Last Answer : Answer: Option B
Description : An ice block with a piece of lead embedded in it floats in water. If ice melts the water level – (1) Rises (2) Falls (3) Remains same (4) Falls first and them rises
Last Answer : (2) Falls
Description : An ice block with a piece of lead embeded in it floats in water. If ice melts the water level (1) Rises (2) Falls (3) Remains same (4) Falls first and then rises
Last Answer : Falls
Description : When two gases are mixed, the entroру (a) Remains constant (b) Decreases (c) Increases (d) Becomes zero
Last Answer : Ans:(c)
Description : For a symmetrical two hinged parabolic arch, if one of the supports settles horizontally, then the horizontal thrust (A) Is increased (B) Is decreased (C) Remains unchanged (D) Becomes zero
Last Answer : (B) Is decreased
Description : For a two-hinged arch, if one of the supports settles down vertically, then the horizontal thrust (A) Is increased (B) Is decreased (C) Remains unchanged (D) Becomes zero
Last Answer : (C) Remains unchanged