Physics MCQs 1st year class
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- 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 - In which of the below numerical values, all 0 are significant?
A. 0.2020
B. 200.2
C. 2020
D. None of these
Correct Answer: 200.2 - Angel between vectors (A×B) and (B×A) is.
A. Zero
B. π
C. π/4
D. π\2
Correct Answer: π - Which unit of physical quantity remains the same for all unit systems?
A. Meter
B. Second
C. Newton
D. Kilogram
Correct Answer: Second - 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
Correct Answer: FPS - Which quantity has a unit of joule-second?
A. Velocity
B. Planck’s constant
C. Energy
D. Viscosity
Correct Answer: Planck’s constant - 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%
Correct Answer: 100% - 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
Correct Answer: All of these - Solid angle is a.
A. Two-dimensional angle
B. Three-dimensional angle
C. One-dimensional angle
D. Dimensionless
Correct Answer: Three-dimensional angle - 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
Correct Answer: Time - 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 - 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 - 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 - 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 - 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°
Correct Answer: 120° - 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
Correct Answer: 7 - 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
Correct Answer: zero - The total sum of 2 forces acting at a point is Sixteen N. If the resultant force is eight N and its direction is perpendicular to minimum force then forces are.
A. 6 N and 10 N
B. 8 N and 8 N
C. Both a and b
D. None of these
Correct Answer: 6 N and 10 N - The gradient of distance- time is equal to:
A. Displacement
B. Velocity
C. Speed
D. Momentum
Correct Answer: Speed