Important Questions of Motion in Straight Line Physics | Zigya

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171.

A police jeep is chasing with a velocity of 45 km/h, a thief in another jeep moving with velocity 153 km/h. Police fire a bullet with muzzle velocity of 180 m/s. The velocity with which it will strike the car of the thief is :

  • 150 m/s

  • 27 m/s

  • 450 m/s

  • 250 m/s


172.

A car covers 2/5 of a certain distance with speed v1 and rest 3/5 part with velocity v2. The average speed of the car is :

  • 12v1v2

  • 5v1v23v1+2v2

  • 2v1v2v1+v2

  • v1+v22


173.

Apparent frequency of sound of engine is changing in the ratio 5/3 under the condition that engine is first aprroaching and then receding away from the observer. If velocity of sound is 340 m/s, then velocity of engine is

  • 340 m/s

  • 170 m/s

  • 85 m/s

  • 310 m/s


174.

If a body travels half the distance with velocity v1 and the next half with velocity v2,its average velocity will be given by

  • v = v1v2

  • v = v1 + v12

  • v = v1v2

  • 2v = 1v1 + 1v2


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175.

The ratio of the numerical value of the average velocity and average speed of body is always

  • unity

  • unity or less

  • unity or more

  • less than unity


176.

A wheel of car is revolving at the rate of 1200 cycle/min. On pressing the accelerator, after 10s, it does 4500 cycle/min then radial acceleration of the wheel is

  • 30 rad/s2

  • 1880 degree/s2

  • 40 rad/s2

  • 1980 degree/s2


177.

If a body loses half of its velocity on penetrating 3 cm in a wooden block then how much will it penetrate more before coming to rest?

  • 1 cm

  • 2 cm

  • 3 cm

  • 4 cm


178.

A stone is dropped in 19.6 m depth well, echo is heard in  2.06 s, then velocity of sound is

  • 315.2 m/s

  • 320.5 m/s

  • 326.7 m/s

  • 332.4 m/s


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179.

An observer is coming towards plane mirror with a speed of 6 m/s, then apparent velocity of his image is

  • 6 m/s

  • 4 m/s

  • 12 m/s

  • 3 m/s


180.

A man wants to slide down a rope. The breaking load for the rope is 23rd ofthe weight of the man. With what minimum acceleration should fireman slide down?

  • g/4

  • g/3

  • 2g/3

  • g/6


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