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Question Bank No: 5

1. A man fires a bullet of mass 200g at a speed of 5m/s. The gun is of 1kg mass for what velocity gun rebounds backward?

a)		0.1m/s
b)		10m/s
c)		1m/s
d)		0.01m/s

2. A body completes a circular path of radius 4m in 40 seconds. The displacement of the particle after 1 minute 40 seconds after the start is

a)		0
b)		4m
c)		6 m
d)		8 m

3. Of the following the fundamental unit is

a)		Newton
b)		Watt
c)		Joule
d)		Kelvin

4. Which of the following is a derived physical quantity?

a)		length
b)		time
c)		velocity
d)		temperature

5. Which of the following not belong to a group?

a)		force
b)		work
c)		momentum
d)		time

6. A particle covers one half of a circle of radius r. Then the distance and displacement of the particle are

a)		2 $π r, r$
b)		$π r, 2 r$
c)		$π r, r$
d)		2 $π r, 2 r$

7. A vehicle travels a distance in 20 mts in such a way that in first 10 mts the speed is 40 km/h. The average speed of the vehicle is

a)		48km/h
b)		50km/h
c)		55km/h
d)		60km/h

8. A car goes from the station X to the station Y at speed of 40km/h and returns to X at a speed of 60km/h. The average speed of car during the entire journey is

a)		48 km/h
b)		50 km/h
c)		55 km/h
d)		0

9. A cyclist moving a circular track of radius 40m completes half a revolution in 40s. The average velocity of the car is

a)		48 km/h
b)		50 km/h
c)		55 km/h
d)		0

10. A cyclist moving a circular track of radius 40m completes half a revolution in 40s. Its average velocity is

a)		0
b)		4 $π m / s$
c)		2m/s
d)		3 m/s

11. A body travels 4m due north and then turns east and travels 3m due east. Displacement of the body is

a)		7m
b)		5m
c)		1m
d)		3.5m

12. A train increases its velocity from 20m/s to 40m/s in 2 seconds. The acceleration of the train is

a)		10 $m / s^{2}$
b)		20 $m / s^{2}$
c)		1 $m / s^{2}$
d)		40 $m / s^{2}$

13. A body is starting from rest and moving with a uniform acceleration of 5 $m / s^{2}$ . The displacement of the body in 10 seconds is

a)		250m
b)		50 m
c)		25 m
d)		2.5 m

14. A body starting from rest and is moving with a uniform acceleration of 10 $m / s^{2}$ . Its velocity after one second is

a)		0
b)		10 $m / s$
c)		20 m/s
d)		100 m/s

15. A student goes from his house to his friend's house with speed $v_{1} .$ Finding the doors of his friend's house closed, returns back to his own house with a speed $v_{2} .$ , velocity after 10 seconds is

a)		0 m/s
b)		10 m/s
c)		20 m/s
d)		100 m/s

16. A student goes from his house to his friend's house with speed $v_{1} .$ Finding the doors of his friend's house closed, returns back to his own house with a speed $v_{2} .$ The average speed of the student is

a)		$(v_{1} + v_{2}) \frac{1}{2}$
b)		$\sqrt{v_{1} v_{2}}$
c)		$2 v_{1} v_{2} / (v_{1} + v_{2})$
d)		$v_{1} v_{2}$

17. A car moves towards north for 2 seconds at a speed of 4m/s and then towards west at a speed of 1m/s for 6 seconds. Its average speed is

a)		7/4 m/s
b)		4/7 m/s
c)		7/2 m/s
d)		5/2 m/s

18. A particle covers 1/4th of the total distance of its motion along a circular path of radius r in 10 seconds. The average velocity is

a)		5/4 m/s
b)		4/5 m/s
c)		4 m/s
d)		5/2 m/s

19. A particle covers 1/4th of the total distance of its motion along a circular path of radius r in 10 seconds. Its average speed during this motion is

a)		$r \sqrt{2} / 10 m / s$
b)		$π r / 10 m / s$
c)		$π r / 20 m / s$
d)		none

20. A car travels from A to B at a speed v and comes back to A at a speed 60 km/h. If the average speed of the car is 48 km/h, average velocity of the particle is

a)		$r \sqrt{2} / 10 m / s$
b)		$π r / 10 m / s$
c)		$π r / 20 m / s$
d)		none

21. A car travels from A to B at a speed v and comes back to A at a speed 60 km/h. If the average speed of the car is 48 km/h, v is

a)		40 km/h
b)		50 km/h
c)		45 km/h
d)		none