# physics MCQs 1st year class online Quiz

## Physics MCQs 1st year class

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### Physics MCQs Online Test Let’s Get Started

1. The units of length, velocity,, and rate of change of momentum are doubled. Which of the correct change in other units?
A. Unit of time is doubled
B. Unit of mass is doubled
C. Unit of momentum is doubled
D. Unit of energy is doubled
Correct Answer: Unit of momentum is doubled
2. In which of the below numerical values, all 0 are significant?
A. 0.2020
B. 200.2
C. 2020
D. None of these
3. Angel between vectors (A×B) and (B×A) is.
A. Zero
B. π
C. π/4
D. π\2
4. Which unit of physical quantity remains the same for all unit systems?
A. Meter
B. Second
C. Newton
D. Kilogram
5. Which of the following system of units is not based on only units of mass length and time?
A. SI
B. MKS
C. CGS
D. FPS
6. Which quantity has a unit of joule-second?
A. Velocity
B. Planck’s constant
C. Energy
D. Viscosity
7. If there is a positive error of 50% in the measurement of velocity of body, then the error in the measurement of kinetic energy is.
A. 25%
B. 50%
C. 100%
D. 125%
8. In accelerated motion _ of moving body changes through motion.
A. Speed
B. Direction of velocity
C. Magnitude of velocity
D. Momentum
E. All of these
9. Solid angle is a.
A. Two-dimensional angle
B. Three-dimensional angle
C. One-dimensional angle
D. Dimensionless
10. The quantities A and B are related by the relation X = A/B where X is the force and A is the momentum. The unit of B is of.
A. Mass
B. Impulse
C. Time
D. None of these
11. Which of the following quantities are vectors?
A. Pressure
B. Temperature
C. Momentum
D. Impulse
E. Both C and D
Correct Answer: Both c and d
12. What happens, when we multiply a vector by (-1)?
A. Direction reverses and unit changes
B. Direction reverses and magnitude is unchanged
C. Direction remains unchanged and unit changes
D. None of above
Correct Answer: Direction reverses and magnitude is unchanged
13. The component of a vector along any direction is.
A. Direction reverses and magnitude is unchanged
B. Always greater than its magnitude
C. Always equal to its magnitude
D. None of these
Correct Answer: Direction reverses and magnitude is unchanged
14. The component of vector A along the X-axis will have maximum value, if
A. A is along the positive Y-axis
B. A is along the positive X-axis
C. A makes an angle of 45° with the x-axis
D. None of these
Correct Answer: A is along the positive X-axis
15. Two equal vectors have a resultant equal of either of the two. The angle between them is.
A. 90°
B. 60°
C. 120°
D.0°
16. The magnitude of a given vector with points (-8,-7,-9) and (-5,-5,-3) must be.
A. 9
B. 7
C. 5
D. None of these
17. The resultant of two vectors having magnitude two and three is one. What is their cross-product?
A. six
B. three
C. one
D. zero