Class 11 Physics · Chapter 3 · Test 1
Rotational Kinematics
35 MCQs This test covers radian measure, angular displacement and its direction, angular velocity, angular acceleration and the relations v = rω and a = rα. It also covers the equations of angular motion with their linear analogues and numerical examples such as the electric fan, CD and car wheel.
35 questions · 30 min · 35 marks
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Sample questions
The first 5 of 35. Try each one, then tap to see the answer.
Question 1
One radian is the angle subtended at the centre of a circle by an arc whose length equals the:
- Adiameter
- Bradius
- Ccircumference
- Dhalf of the radius
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Answer: B
By definition an arc equal in length to the radius subtends an angle of one radian.
Question 2
Rotational motion of a rigid body is described by the rotation of:
- Athe heaviest particle only
- Bthe centre of mass only
- Cthe reference line OP
- Dthe axis of rotation
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Answer: C
The perpendicular OP dropped from a point to the axis acts as the reference line and all its angular quantities describe the whole body.
Question 3
The relation S = rθ is valid only when θ is measured in:
- Adegrees
- Brevolutions
- Cradians
- Dminutes of arc
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Answer: C
The relation follows from the definition of the radian so θ must be in radians.
Question 4
One complete revolution corresponds to an angle of:
- Aπ rad
- B2π rad
- Cπ/2 rad
- D4π rad
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Answer: B
The circumference is 2πr so the full angle is 2π radians.
Question 5
One radian is approximately equal to:
- A57.3°
- B360°
- C180°
- D3.14°
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Answer: A
1 rad = 360°/2π which is about 57.3°.
More tests in Circular and Rotational Motion
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