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When a bullet is fired at a target, its velocity decreases by half after penetrating 30 cm into it. The additional thickness it will penetrate before coming to rest is

1) 30 cm 2) 40 cm 3) 10 cm 4) 50 cm Answer: 3) 10 cm Solution: Let the velocity of... View Article

1) 10 2) 15 3) 20 4) 30 Answer: 1) 10 Solution: u is the initial velocity a is the acceleration... View Article

1) 1.6 ms-2 2) 160 ms-2 3) 1600 ms-2 4) 16 ms-2 Answer: 3) 1600 ms-2 Solution: V2=u2+2as 802 = 0... View Article

1) 24 m 2) 40 m 3) 56 m 4) 16 m Answer: 3) 56 m Solution: Given, the distance travelled... View Article

A body dropped from top of a tower fall through 60 m during the last 2s of its fall. The... View Article

A balloon going upward with a velocity of 12 ms-1 is at a height of 65 m from the earth’s... View Article

1) zero 2) -5 ms-1 3) 10 ms-1 4) 20 ms-1 Answer: 2) -5 ms-1 Solution: From the equation of motion,... View Article

From the top of a tower, two stones, whose masses are in the ratio 1 : 2 are thrown on... View Article

1) 400 m 2) 150 m 3) 100 m 4) 200 m Answer: 4) 200 m Solution: s = ut +... View Article

1) 6 2) 10 3) 4 4) 8 Answer:4) 8 Solution: v2= u2 + 2as When acceleration is negative v2=... View Article

A point initially at rest moves along X-axis. Its acceleration varies with time as a = (6t + 5) m... View Article

A body is moving along a straight line path with constant velocity. At an instant of time the distance travelled... View Article

A particle moves along X-axis. The position x of particle w.r.t. time t from origin given by x = b0... View Article

The distance travelled s by an accelerated particle of mass M is given by the following relation [in MKS units]... View Article

1) 15 t2 2) 20 t2 3) 5 t2 4) None of these Answer: 1) 15 t2 Solution: Given x = 3t2 and... View Article

A ball is dropped from the roof of a tower of height h. The total distance covered by it in... View Article

A ball is dropped from a bridge at a height of 176.4 m over a river. After 2s, a second... View Article

1) 22/3 2) 40/3 3) 20/3 4) 22/5 5) 26/5 Answer: 2) 40/3 Solution: (from A to B) v2 = u2... View Article

1) Joule 2) Joule-coulomb 3) Volt-coulomb 4) Joule/coulomb Answer: 4) Joule/coulomb Solution: Unit of e.m.f = volt = joule/coulomb.

1) Energy of γ-rays 2) Half life 3) Radioactivity 4) Intensity of γ- rays Answer: 3) Radioactivity Solution: Curie is the... View Article