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Saturday, March 28, 2009

Physics 2

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

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