11th class (Fsc) Physics unit 5 MCQs
chapter 5 MCQs 11th Class Physics
Circular Motion:
1. 𝜋 radian is equal to:
a. 57.3o
b. 0o
c. 180o
d. 90o
2. The angle subtended at the center by circumference of circle is:
a. 2𝜋 rad
b. 𝜋 rad
c. 𝜋/2 rad
d. 𝜋3 rad
3. One revolution is equal to:
a. 𝜋/2 rad
b. 𝜋 rad
c. 𝜋/4 rad
d. 2𝜋 rad
4. One radian is equal to:
a. 𝜋/2 rec
b. 2𝜋 rev
c. 1/2𝜋 rev
d. 𝜋/4 rev
5. 100 radians are equal to:
a. 5730o
b. 57.3o
c. 5.73o
d. 573o
6. The SI unit of angular displacement is:
a. Radian
b. Degree
c. Rotation
d. Revolution
7. All points on a rigid body rotating about a fixed axis do not have same:
a. Angular acceleration
b. Speed
c. Angular displacement
d. Angular speed
8. Which quantity of the following is dimensionless?
a. Centripetal force
b. Angular velocity
c. Angular displacement
d. Angular acceleration
9. A wheel of radius 2m turns through an angle of 57.3. it lays out a tangential distance:
a. null
b. 2m
c. 114.6 m
d. 4m
10. 2 radian =?
a. 75.3o
b. 114.6o
c. 37.5o
d. 57.3o
11. 36o is equal to:
a. 𝜋/5
b. 𝜋/8
c. 𝜋/12
d.𝜋/6
12. A wheel of diameter 1m makes 60rev / min. the linear speed of a point on its rim in ms-1 is:
a. 𝜋/2
b. 𝜋
c. 3𝜋
d.2𝜋
13. As we go from pole to equator of earth, the value of ‘g’:
a. Remains constant
b. Increases
c. Zero
d. Decreases
14. Error in the measurement of radius of sphere is 1%. The error in the calculated value of its area is:
a. 3%
b. 1%
c. 4%
d. 2%
15. If the mass of a body is doubled, then acceleration becomes:
a. Double
b. One fourth
c. Constant
d. Half
16. The moment of inertia of 10kg hoop about the axis of rotation perpendicular to its plane having radius 5m is:
a. 150 kgm2
b. 50 kgm2
c. 250 kgm2
d. 100 kgm2
17. A body is rotated in a vertical circle by a string. The tension in the string is minimum at the:
a. Mid position between top and bottom
b. Top
c. Remain same
d. Botton
18. ꞷ= 60 revmin-1 equal to:
a. 1/π rad s-1
b. π rad s-1
c. 2/π rad s-1
d. 2π rad s-1
19. If a body is moving in the counter clockwise direction then the direction of angular velocity will be:
a. Along the linear velocity
b. Towards the centre
c. Perpendicular to both radius and linear velocity
d. Away from the centre
20. If a car moves with a uniform speed of 2 m/ sec in a circle of radius 0.4 m its angular speed is:
a. 1.6 rad / sec
b. 4 rad / sec
c. 2.8 rad / sec
d. 5 rad / sec
21. A body rotating with angular velocity of 2 radian / s and linear velocity is also 2 ms-1, then radius of circle is:
a. 4 m
b. 1 m
c. 2 m
d. 0.5 m
22. The dimensions of angular velocity are:
a. [T-1]
b. [LT-1]
c. [L-1T-1]
d. [LT-2]
23. Ratio of velocities of hoop and disc rolling down form an inclined plane of height h are Vh/Vd
a. 1.0
b. 0.5
c. 1.15
d. 0.86
24. A body starting from rest attains angular acceleration of S rad s-2 in 2 second. Final angular velocity will be:
a. 3 rads-1
b. 10 rads-1
c. 2 rads-1
d. 7 rads-1
25. Revolution per minute is unit for:
a. Angular acceleration
b. Angular displacement
c. Time
d. Angular velocity