Important Multiple Choice Questions of physics || Class 11 ||
1. A particle moves along a straight-line y= 3x + 5. Which coordinate changes at faster rate?
a) X- coordinate
b) y-coordinate
c) both x and y
d) insufficient data
Ans: b) y-coordinate (Let suppose x=1,then y=8 ,x= 2 ,y = 11. So y coordinate is increasing 3 times faster as compare to X- coordinate ) .
2. If 𝐴⃗ + 𝐵⃗⃗ = 𝐶⃗ and A+B = C then the angle between 𝐴⃗ and 𝐵⃗⃗ is-
a) 0
b) π/4
c) π/2
d) π
Ans: c) π/2
3. If a unit vector is represented by 0.5𝑖− 0.8𝑗+ c k then the value of ‘c’ is-
a) 1
b) √0.11
c) √0.01
d) √0.39
Ans: b) √0.11
4. Given that A = B. what is the angle between (𝐴⃗ + 𝐵⃗⃗) and (𝐴⃗ − 𝐵⃗⃗⃗⃗⃗⃗⃗⃗) =?
a) 30°
b) 60°
c) 90°
d) 180°
Ans: d) 180°
5. What is the component of the (3i+4j) along (i + j)?
a) ½ (i + j)
b) 3/2(i + j)
c) 5/2 (i + j)
d) 7/2 (i + j)
Ans: d) 7/2 (i + j)
6. What is the value of (𝐴⃗ + 𝐵⃗⃗).( 𝐴⃗ × 𝐵⃗⃗)?
a) 0
b) A²-B²
c) A²+B²+2AB
d) None of these
Ans: a) 0
7. The angle between (𝐴⃗𝑋𝐵⃗⃗) and (𝐵⃗⃗𝑋𝐴⃗) is-
a) π rad
b) π/2 rad
c) π/4 rad
d) 0
Ans: a) π rad
8. A man walks 30 m towards north, then 20 m towards east and in the last 30√2m towards south west. The displacement from origin is –
a) 10 m towards west
b) 10 m towards east
c) 60√2m towards North-west
d) 60√2m towards east north
Ans: a) 10 m towards west
9. A man walks for some time t with velocity (v) due east. Then he walks for the same time t with velocity (v) due north. The average velocity of the man is-
a) 2v
b) √2v
c) v
d) v/√2
Ans: b) √2v
10. If a body covers 3 consecutive equal distances with speeds v1, v2, v3 then the average speed of the body is-
a) 3 𝑣1+𝑣2+𝑣3
b) 2𝑣1𝑣2𝑣 / 1+𝑣2+𝑣3
c) 3𝑣1𝑣2𝑣3𝑣 / 1+𝑣2+𝑣3
d) 3𝑣1𝑣2𝑣3 / 𝑣1 𝑣2+𝑣2 𝑣3+𝑣3 𝑣1
Ans: d) 3𝑣1𝑣2𝑣3 / 𝑣1 𝑣2+𝑣2 𝑣3+𝑣3 𝑣1
11. A particle moves along a straight line such that its displacement at any time t is given by s= (t³- 6t²+3t+4) meters. The velocity when the acceleration is zero is-
a) 3 m/s
b) -12 m/s
c) 42 m/s
d) -9 m/s
Ans: c) 42 m/s
12. The motion of a particle is described by the equation- x = a + b t² where a = 15 cm and b= 3 cm/s2. It's instantaneous velocity at time 3 sec will be-
a) 36 cm/s
b) 18 cm /s
c) 16 cm/s
d) 32 cm/s
Ans: d) 32 cm/s
13. graph between the v2 of a particle and the distance has been showed. The acceleration of particle in Km/h² is-
a) 2250
b) 3084
c) -2250
d) -3084
Ans: b) 3084
14. Working or rocket or jet is based on-
a) Newton’s, I law
b) Newton’s, II law
c) Newton’s, III law
d) All of three laws
Ans: c) Newton’s, III law
15. A player catches a ball of 200 gm moving with a Speed of 20 m/s. if the time taken to complete the catch is 0.5 sec, the force exerted on player’s hand is-
a) 8 N
b) 4 N
c) 2 N
d) 0
Ans: a) 8 N
16. find the tension T2 for the system shown in figure-
a) 1g
b) 2g
c) 5g
d) 4g
Ans: c) 5g
17. The elevator shown in the figure is descending with an acceleration of 2 m/s². The mass of the block A is 0.5 kg. the force exerted by the block A on block B is-
a) 2 N
b) 4 N
c) 6 N
d) 8 N
Ans: b) 4 N
18. three blocks are connected as shown in the figure on a horizontal frictionless table. If M1 = 1 kg, M2= 8 kg, M3 = 27 kg and T3= 36N, T2 will be-
a) 18 N
b) 9 N
c) 3.375 N
d) 1.75 N
Ans: b) 9 N
19. The coefficient of friction between two surfaces depends on-
a) The nature of the surface
b) The shape of the surface in contact
c) The area of contact
d) All of the above
Ans: a) The nature of the surface (Smoothness Or roughness of the surface).
20. A cubical block rests on a plane of µ = 1 √3 . What is the angle of inclination of plane through which the block just starts to slide-?
a) 30°
b) 45°
c) 60°
d) 15°
Ans: a) 30°
21. A force F = (3x2+ 2x- 7) N acts on a 2 kg body because of which the body gets displaced from x= 0 to x = 5cm. the work done by the force will be-
a) 35 J
a) 70 J
c) 115 J
d) 270 J
Ans: a) 70 J
22. A force acts F = (5i+4j) N on a body and produced a displacement d = (6i – 5j+3k) m. the work done will be-
a) 30 J
b) 40 J
c) 10 J
d) 20 J
Ans: c) 10 J
23. Two balls of masses 2kg and 4kg are dropped from a height of 60 feet. After a fall of 30 feet each towards the earth, their respective kinetic energies will be in the ratio of-
a) 1:4
b) 1;2
c) 1: √2
d) √2:1
Ans: a) 1:4
24. Two men weighs in the ratio of 5:3 run up a staircase in times in the ratio 11:9. The ratio of power of first to that of second is-
a) 15:11
b) 11:15
c) 11:9
d) 9:11
Ans: c) 11:9
25. A spring of force constant 800 N/m has an extension of 5 cm. the work done in extending it from 5 cm to 15 cm is-
a) 16 J
b) 8 J
c) 32 J
d) 24 J
Ans: b) 8 J
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