Description : A six feet tall lady wants to see her full image in a plane mirror . The minimum length of the mirror will be ? A. 6 feet B. 12 feet C. 4 feet D. 3 feet (Answer) E. None of these
Last Answer : D. 3 feet (Answer)
Description : I'm curious why my dog often sees his own reflection in a large glass door and barks at himself as if there is another dog outside, but when I have him sit in front of a full-length mirror he never reacts to his own reflection?
Last Answer : I think the difference is that the dog in the glass is outside the boundary of the den—your house—and thus is not recognized as himself. Therefore, barking.
Description : The image of an object formed in a plane mirror (a) is real (b) is virtual (c) can be obtained on screen (d) is slightly shorter than the object
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 : Minimum width of landing should be (A) Equal to width of stairs (B) Half the width of stairs (C) Twice the width of stairs (D) One fourth the width of stairs
Last Answer : Answer: Option A
Description : In Fig. a plane mirror lies at a height h above the bottom of a beaker containingwater (refractive index `mu`) upto a height f. Find the position of t
Last Answer : In Fig. a plane mirror lies at a height h above the bottom of a beaker containingwater (refractive index ... f. Find the position of the image of the
Description : Pick up the correct statement from the following: (A) The cost of square rooms is less (B) The expenditure on the foundation and roof for the double storeyed building is nearly half of that ... cost of construction of a house may be minimised by restricting the height floors (D) All the above
Last Answer : Answer: Option D
Description : Which of the following is not a characteristic of organic compounds? (a) They usually have low melting points. (b) They usually are only slightly soluble or insoluble in water. (c) If water ... they seldom conduct an electric current. (d) Bonds which bind the atoms together are nearly always ionic.
Last Answer : Bonds which bind the atoms together are nearly always ionic.
Description : The focal length of a plane mirror is (1) Positive (2) Negative (3) Zero (4) Infinity
Last Answer : (4) Infinity Explanation: A plane mirror is a mirror with a flat reflective surface. The focal length of a plane mirror is infinity. Its optical power is zero.
Description : Actual height of antenna should be at least A. one wavelength B. half wavelength C. quarter wavelength D. three-fourth wavelength
Last Answer : C. quarter wavelength
Description : Center of gravity of a solid cone lies on the axis at the height (A) One-fourth of the total height above base (B) One-third of the total height above base (C) One-half of the total height above base (D) Three-eighth of the total height above the base
Last Answer : (A) One-fourth of the total height above base
Description : Center of gravity of a thin hollow cone lies on the axis at a height of (A) One-fourth of the total height above base (B) One-third of the total height above base (C) One-half of the total height above base (D) Three-eighth of the total height above the base
Last Answer : (B) One-third of the total height above base
Description : Six persons Amit , Balu, Chetan, Daya, Jay and Ravi are arranged in a row and occupations are Teacher, Doctor, Lawyer, Police, Driver and Engineer respectively. I. A is an engineer placed at one of the ends II. ... and Doctor. Who is the only person between Doctor and Teacher? a)C b) D c)B d) F
Last Answer : Ans: option (b)
Description : An object of height 4 cm is kept at a distance of 80 cm from the pole af a diverging mirror. If the focal length of the mirror is 10 cm. the height of the image formed is (a) + 3.0 cm (b) + 2.5 cm (c) + 1.0 cm (d) + 0.75 cm
Last Answer : (c) + 1.0 cm
Description : A journal bearing with hydrodynamic lubrication is running steadily with a certain amount of minimum film thickness. When the load and speed are doubled, how does the minimum film thickness vary? [IES-2008 ... Gets reduced to one-fourth of original value (d) Gets reduced to half of original value
Last Answer : (a) Remains unchanged
Description : A boy sitting in a rail road car throws a ball straight up into the air. The ball will fall back into his hands when the rail road car is a.moving at constant velocity b.accelerating ... inclined plane, while another identical block B is released for free fall from the same height e.decelerating
Last Answer : a. moving at constant velocity
Description : What type of mirror is used by motorists to see the road behind them? (a) Convex (b) Concave (c) Plane (d) Concave-convex
Last Answer : Ans:(a)
Description : A boy is standing in front of and close to a special mirror. He finds the image of his head bigger than normal, the middle part of his body of the same size, and his legs smaller than normal. The ... , Plane, Concave (b) Plane, Convex, Concave (c) Concave, Plane, Convex (d) Convex, Concave, Plan
Last Answer : (c) Concave, Plane, Convex
Description : The type of mirror used in automobiles to see the traffic on the rear side is (1) Concave (2) Plano-Convex (3) Plane (4) Convex
Last Answer : Convex
Description : An observer moves towards a stationary plane mirror at a speed of 1 m/s. His image will move towards him at a speed of (a) 1 m/s (b) 4 m/s (c) 2 m/s (d) ½ m/s
Last Answer : Ans:(c)
Description : What will be the change in resistance of a constantan wire when its radius is made half and length reduced to one-fourth of its original length ?
Last Answer : What will be the change in resistance of a constantan wire when its radius is made half and length reduced to one-fourth of its original length ?
Description : If a copper wire is increased to double its length, its resistance will become – (1) four times (2) one-fourth (3) double (4) half
Last Answer : (3) double Explanation: There is a direct relationship between the amount of resistance encountered by charge and the length of wire it must traverse. After all, if resistance occurs as the result of collisions ... the atoms of the wire, then there is likely to be more collisions in a longer wire.
Description : In long and short wall method of estimation, the length of long wall is the centre to centre distance between the walls and (A) Breadth of the wall (B) Half breadth of wall on each side (C) One fourth breadth of wall on each side (D) None of these
Last Answer : (B) Half breadth of wall on each side
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 : If a copper wire is increased to double its length, its resistance will become (1) four times (2) one–fourth (3) double (4) half
Last Answer : double
Description : A man is running away from a plane mirror at the speed of `5 ms^(-1)`. With what speed is he receding from his own image ?
Last Answer : A man is running away from a plane mirror at the speed of `5 ms^(-1)`. With what speed is he receding from his own image ?
Description : A boy is standing in front of a plane mirror at a distance of 3 m from it. What is the distance between the boy and his image? (1) 3 m (2) 6 m (3) 4.5 m (4) None of these
Last Answer : (2) 6 m Explanation: The image formed by a plane mirror is always virtual upright, and of the same shape and size as the object it is reflecting. A virtual image is a copy of an object formed at the location from which the light rays appear to come
Description : What is the minimum age for opening a single saving account by a minor himself in his name? a) 10 years b) 14 years c) 18 years d) No min age limit
Last Answer : a) 10 years
Description : An object is placed at a distance equal to the focal length of convex mirror. If the focal length of the mirror be f, then the distance of the image from the pole of the mirror is (a) Less than f (b) Equal of f (c) More than f (d) Infinity
Description : A concave mirror produces a real, inverted image of the same size of the object. Then, the object is at a distance (a) Less than f from the mirror (b) Equal to f from the mirror (c) Equal to 2f from the mirror (d) Larger than 2F from the mirror where f is the focal length of the mirror
Description : Two army persons A and B each of weight of 500 N climb up a rope through a height of 10 m. A takes 20 s while B takes 40 s to achieve this task. What is ratio of the powers of person A and B? -Physics
Last Answer : The ratio of powers of A and B = 2: 1 Explanation : Where , Fa = 500N S = 10m Fb = 500N ta = 20s , tb = 40s Image solution
Description : Since when can a person's worth to society be reflected in a mirror?
Last Answer : answer:I agree that this phenomenon exists. I suspect it is something fairly innate, not just culture. I know there are cultures where bigness is a sign of status and wealth. So I could be wrong. But I do think ... mate a person is. It's built into us, I believe, and it won't ever evolve out of us.
Description : Under section 65 of IPC sentence of imprisonment for non-payment of fine shall be limited to (a) One-third of the maximum term of imprisonment fixed for the offence (b) One-fourth of the ... imprisonment fixed for the offence (d) Equal to the maximum term of imprisonment fixed for the offence.
Last Answer : (b) One-fourth of the maximum term of imprisonment fixed for the offence
Description : A foundation is called shallow if its depth, is (A) One-fourth of its width (B) Half of its width (C) Three-fourth of its width (D) Equal to its width
Description : In a short cylindrical external mouthpiece, the vena contracta occurs at a distance __________ the diameter of the orifice from the outlet of orifice. (A) Equal to (B) One-fourth (C) One-third (D) One-half
Last Answer : Answer: Option B
Description : The power transmitted through the pipe is maximum when the head lost due to friction is equal to (A) One-fourth of the total supply head (B) One-third of the total supply head (C) One-half of the total supply head (D) Two-third of the total supply head
Description : The discharge through a convergent mouthpiece is __________ the discharge through an internal mouthpiece of the same diameter and head of water. (A) Equal to (B) One-half (C) Three fourth (D) Double
Description : The breadth of rib in a T-beam should at least be equal to __________the depth of rib (a) One –half (b) One –third (c) One-fourth (d) One –sixth
Last Answer : (b) One –third
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 : A uniformly-loaded D.C. distributor is fed at both ends with equal voltages. As compared to a similar distributor fed at one end only, the drop at the middle point is (a) one-fourth (b) one-third (c) one-half (d) twice (e) none of the above
Last Answer : (a) one-fourth
Description : Which one of these is NOT true? w) All planets revolve in the same direction. x) All planets rotate in the same direction. y) The orbits of the planets are all ellipses. z) The orbits of the planets are nearly in the same plane.
Last Answer : ANSWER: X -- ALL PLANETS ROTATE IN THE SAME DIRECTION.
Description : Six persons Amit , Balu, Chetan, Daya, Jay and Ravi are arranged in a row and occupations are Teacher, Doctor, Lawyer, Police, Driver and Engineer respectively. I. A is an engineer placed at one of the ends ... . If F is Police, then the occupation of E is a) Teacher b) Doctor c) Lawyer d) Engineer
Last Answer : a) Teacher
Description : Six persons Amit , Balu, Chetan, Daya, Jay and Ravi are arranged in a row and occupations are Teacher, Doctor, Lawyer, Police, Driver and Engineer respectively. I. A is an engineer placed at one of the ends II. ... Doctor. What is the occupation of D? a) Driver b) Lawyer c) Either a or b d) Police
Last Answer : Ans: option (c)
Description : The focal length of a concave spherical mirror is equal to 1 meter. What is the radius of curvature of this mirror?
Last Answer : ANSWER: 2 METERS
Description : Which of the following does not constitute a practice of accountancy? a. A person holding out himself as one skilled in the knowledge, science and practice of accounting and as a qualified person ... d. A person is appointed as a marketing director of a government owned and controlled corporation.
Last Answer : A person is appointed as a marketing director of a government owned and controlled corporation.
Description : Two bodies of mass 6 kg and 9 kg are connected with a light inextensile string passing over a smooth pulley with one of the bodies on a smooth inclined plane (θ = 30°) and the other hanging freely from the ... kg up the entire length is half the time taken by 6 kg to pull 9 kg over the same plane.
Last Answer : Given: Mass of body A (mA) = 6 kg Mass of body B (mB) = 9 kg Angle of inclination of the plane (θ) = 30° Let's assume that the acceleration of body A (aA) and body B (aB) are in opposite ... we know that the time taken (t) is given by the formula: t = √(2d/a), where d is the distance travelled
Description : Tharun has to cover a distance of 84 km in 40 minutes. If he covers one-half of the distance in one-fourth of the total time, to cover the remaining distance in the remaining time, what should be his speed in km/hr? a) 42 km/hr b) 64km/hr c) 84km/hr d)76km/hr
Last Answer : C Tharun needs to cover 84 km in 40minutes Given that he covers one-half of the distance in one-fourth of the total time ⇒ he covers half of 84km in one-fourth of 40 minutes ⇒ He covers 42 km in ¼ * ... Distance =42km Time =30minutes =1/2 hr Required Speed = Distance / Time =42/(1/2)=84 km/hr
Description : If you look into a mirror and find that the image (your reflexion) is smaller than you, then the type of the mirror is - (1) plano-concave mirror (2) concave mirror (3) plane mirror (4) convex mirror
Last Answer : (4) convex mirror Explanation: A convex mirror, diverging mirror, or fish eye mirror is a curved mirror in which the reflective surface bulges toward the light source. Such mirrors always form a virtual image and the image is smaller than the object.
Description : The size of the image formed by a plane mirror is a) bigger than the object b)same as object c)smaller than the object d)far away from the object .
Last Answer : b)same as object
Description : A virtual image can be formed by one or more of the following single mirrors? Identify them. w) plane mirror x) concave spherical mirror y) convex spherical mirror z) all of the above
Last Answer : ANSWER: Z -- ALL OF THE ABOVE (accept: A, B and C)