Physics Questions and Answers for Competitive Exam

Physics GK

Q.25 If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then both bodies acquire the same.

(A) velocity

(B) kinetic energy

(C) acceleration

(D) momentum

Q.26Pick out the scalar quantity

(A) force

(B) pressure

(C) velocity

(D) acceleration

Q.27Rectifiers are used to convert

(A) Direct current to alternating current

(B) alternating current to direct current

(C) high voltage to low voltage

(D) low voltage to high voltage

Q.28  Of the following properties of a wave, the one that is independent of the other is its.

(A) amplitude

(B) velocity

(C) wavelength

(D) frequency

Q.29 Find the maximum velocity for the overturn of a car moving on a circular track of radius 100m. The co-efficient of friction between the road and tyre is 0.2.

(A) 0.14 m/s

(B) 140 m/s

(C) 1.4 m/s

(D) 14 m/s

Q.30 It is more difficult to walk on a sandy road than on a concrete road because

(A) sand is soft and concrete is hard

(B) the friction between sand and feet is less than that between concrete and feet

(C) the friction between sand and feet is more than that between concrete and feet

(D) the sand is grainy but concrete is smooth

Q.31 Magnetism at the centre of a bar magnet is

(A) minimum

(B) maximum

(C) zero

(D) minimum of maximum

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