Important Physics MCQs-2

1. _________ is the SI unit of solid angle.
(A) candela
(B) steradian
(C) degree
(D) radian

2. Unit of the amount of substance is
(A) mole
(B) joule
(D) amount of substance

3. How can we reduce random errors
(A) comparing the instrument with another more accurate one
(B) taking mean of several measurements
(C) taking zero correction
(D) all A, B, and C are correct

4. The solid angle is represented by
(A) cd
(B) rad
(C) sr
(D) none of the above

5. Scalar physical quantity is completely specified by
(A) a number with proper units
(B) a direction only
(C) a number only
(D) a number with a direction

6. Which of the following is an example of the scalar quantity
(A) velocity
(B) torque
(C) acceleration
(D) energy

7. Which of the following is the vector quantity
(A) charge
(B) impulse
(C) density
(D) power

8. There are two forces 5N and 12N making an angle 90° with each other is
(A) 14N
(B) 15N
(C) 7N
(D) 17N

9. What is the angle between two rectangular components of any vector?
(A) 90°
(B) 180°
(C) 50°
(D) 30°

10. Torque is also defined as
(A) moment of inertia
(B) moment of force
(C) angular velocity
(D) moment of arm

11. What will be the angle when the dot product of two non-zero vectors is zero?
(A) 180°
(B) 90°
(C) 30°
(D) 40°

12. Two vectors are negative when the scalar product is
(A) an anti-parallel vector
(B) a parallel vector
(C) parallel with some magnitude
(D) a perpendicular vector