Physics 1st Half Book Test

A body of mass 5 kg is moving along a straight line with a velocity of 2ms–1. A variable force F started acting on it for a time period of 0.5s as shown in force-time curve. The final velocity of the block is

• 2 ms^–1

• 2.2 ms^–1

• 2.5 ms^–1

• 2.7 ms^–1

Vertical circular motion is an example of non-uniform motion and for completion of vertical circular motion the maximum velocity at the start of vertical motion from lowest point is

A person can throw a stone to maximum distance of 80m the greatest height to which he can throw the stone is

• 100 m

• 80 m

• 50 m

• 20 m

Galileo writes that for angles of projection of a projectile (45^o + θ) and (45^o -θ) , the horizontal ranges described by the projectile are in the ratio of

• 2 : 1

• 1 : 2

• 1 : 1

• (45^o + θ): (45^o -θ)

A force of 250 N acts on a body. The momentum acquired by the body is 125 kg m/s. what is the duration for which force acts on body

• 0.5 s

• 125 x 250 s

• 0.2 s

• 2 s

The fundamental frequency of an open organ pipe is n. The pipe is vertically immersed in water such that half of its length is submerged. The fundamental frequency of air column in this position will be:

• n/3

• n/2

• n

• 2n

When 110 J of heat is added to a gaseous system, internal energy increases by 40 J; the amount of work done is:

• 150 J

• 70 J

• 110 J

• 40 J

A bomb of mass 16 kg at rest explodes into two pieces of masses 4 kg and 12 kg. The velocity of the 12 kg mass is 4ms–1. The kinetic energy of the other mass is

• 144 J

• 288 J

• 192 J

• 96 J

An automobile traveling with a speed of 60 km/h, can brake to stop within a distance of 20 m. If the car is going twice as fast i.e. 120 km/h, the stopping distance will be (if breaking force is same)

• 60 m

• 20 m

• 4 m

• 80 m

From top of tower two stones having masses in the ratio 1 : 2 are thrown, one straight up with speed V and second straight down with same speed v. Neglecting air resistance

• The heavier stone hit the ground with higher speed

• The lighter stone hit the ground with higher speed

• Both stones hit the ground with same speed

• Data insufficient