Q-1 For retardation, the value of acceleration is

(a) 0

(b) Negative

(c) Positive

(d) None

Q-2 V = V0 + a……

(a) t2

(b) t3

(c) t

(d) None

Q-3 R = A + B is

(a) Triangle law of vector addition

(b) Newton law

(c) Einstein law

(d) None

Q-4 If two vectors are in same direction, then their resultant will be

(a) Max.

(b) Minimum

(c) a & b

(d) None

Q-5 What can you said about unit vector?

(a) it is unit less

(b) its unit is cm

(c) its unit is kg

(d) None

Q-6 Pressure is a

(a) Scalar quantity

(b) Vector Quantity

(c) a& b

(d) None

Q-7 If two vectors are in opposite direction, then their resultant will be

(a) Minimum

(b) Max.

(c) a & b

(d) None

Q-8 If one vector is 5 and other vector is 3 then its resultant will be

(a) 8

(b) 9

(c) 10

(d) 11

Q-9 What is magnitude unit vector?

(a) 1

(b) 2

(c) 3

(d) 4

Q-10 If two vectors have equal magnitude & same direction then it is

(a) equal vector

(b) Negative vector

(c) Zero vector

(d) None

Q-11 If two vector are in same direction then the angle made by resultant with vector A will be

(a) 0

(b) 3

(c) 4

(d) 5

Q-12 When direction of motion change the value of acceleration will be

(a) change

(b) Increase to 1

(c) decrease to 1

(d) None

Q-13 Which is correct formula for average acc?

(a) Vav = 4 + v/2

(b)Vav = 4 + v/3

(c) 4 – 3/2

(d)None

Q-14 If V = 540 km/h Then its value is ms-1 will be

(a) 150 ms-1

(b) 160 ms-1

(c) 70 ms-1

(d) 180 ms-1

Q-15 A train initially at rest & after that uniformly accelerates to a distance 72kmph in 30 sec. what will be the distance covered by train in 30 sec.

(a) 300m

(b) 400m

(c) 600m

(d) None

Q-16 If a stone falling down, then what will be its value of g

(a) -9.8 ms-2

(b) 9.6 ms-2

(c) 10 ms-2

(d) -10.6 ms-2

Q-17 If a body falling freely then its value of V will be

(a) V = gt

(b) V2 = gt

(c) v3 = gt

(d) V = gt2

Q-18 Velocity of man increase uniformly from 20 ms-1 to 30 ms-1 , when he covered 40 m what will be its acc?

(a) 5/3 ms-1

(b) 5/8 ms-2

(c) 5/3 ms2

(d) None

Q-20 If x = 25t + 10, what will be its velocity

(a) 25

(b) 30

(c) 35

(b) 40

Q-21 If x = 25t2 + 16t, Find the value of acc

(a) 50

(b) 60

(c) 70

(d) 90

Q-22 Distance does not tell is about?

(a) Direction

(b) Velocity

(c) Momentum

(d) None

Q-23 From 5.2 & 5.26, which is more actuate?

(a) 5.2

(b) 5.26

(c) a & b

(d) None

Q-24 If a man weight 900 gm in place of 1000 gm Then what will be

(a) 100 gm

(b) 15 gm

(c) 25 gm

(d) 19gm

Q-25 After rounding of 9.670 becomes

(a) 9.7

(b) 9.67

(c) 9.678

(d) None

Answers

1. b

2. c

3. a

4. a

5. a

6. b

7. a

8. a

9. a

10. a

11. a

12. a

13. a

14. a

15. a

16. a

17. a

18. b

19. b

20. a

21. a

22. a

23. b

24. a

25. a

Reason:

15 V0 = 0, V = 72 kmph

V = 72 × 5/18. ms-1 = 20 ms-1

T = 30 sec

S = v0 t + (1/2) at2

= 0 + (1/2) (a) (30)2 ------(1)

to solve a

V = V0 + at

20 = 0 + a(30)

a = 2/3

Put in (1)

5 = 0 + (1/2) (2/3) (30)2

= 300m

19 V0 = 20, V = 30

S = 40

V2 V02 = 20.5

302 – 202 = 20(40)

900 – 400 = 800(a)

500 = 800 a

a = 5/8 ms-2

20 x = 25t + 10

V = dx/dt = 25

21 x = 25t2 +16t

V = dx/dt = 50t + 16

A = d2x/dt2 = 50 + 0

A 50

## Saturday, March 28, 2009

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