All Free Physics MCQs with Answers

• A. compressibility
• B. young's modulus
• C. bulk's modulus
• D. shear's modulus

Explanation: Compressibility is the ratio of volumetric strain to volumetric stress. It is the inverse of bulk's modulus. Its SI unit is the pascal.

• A. ductile substance
• B. brittle substance
• C. plastic substance
• D. all of these

Explanation: The substance which undergoes plastic deformation until it breaks is a DUCTILE SUBSTANCE. Therefore, option 'A' is correct.

• A. k + 2
• B. k/2
• C. 2k
• D. k

Explanation: According to Hooke's Law, the force exerted by a spring is given by F = -kx, where k is the spring constant and x is the displacement.

• A. 8.0N
• B. 28N
• C. 160N
• D. 400N

Explanation: According to Hooke's Law, the force F exerted by a spring is directly proportional to the displacement x from its equilibrium position…

• A. 8.0N
• B. 28N
• C. 160N
• D. 400N

Explanation: In order to find the displacement x we subtract the untstrected length from the overall length.

• A. T-2
• B. LT-2
• C. LT-1
• D. M1T-2

Explanation: Angular acceleration (α) is defined as the rate of change of angular velocity (ω) with respect to time (t). Therefore, α = Δω/Δt.

• A. (MLT)
• B. (M2 42 L)
• C. (ML2 T-2)
• D. (ML2 T2)

Explanation: The SI unit for torque is the Newton-metre or kgm2sec-2. Torque has the dimension of force times distance, symbolically T−2L2M.

• A. strain
• B. refractive index
• C. magnification
• D. All of these

Explanation: The given dimensions indicate a dimensional quantity. Strain = change in length/original length [L]/[L] =1 so it is dimensionless…

• A. angular momentum
• B. power
• C. impulse
• D. viscosity

Explanation: The dimensions ML-1T-1 indeed correspond to viscosity. The correct explanation for option D is as follows:Viscosity is a property of…

• A. Second
• B. Weber
• C. Henry
• D. Tesla

Explanation: The product of Ohm (unit of resistance) and Farad (unit of capacitance) results in the unit of time, which is the second.

• A. 3km
• B. 9km
• C. 7km
• D. 5km

Explanation: We have to find the displacement of the cyclist from the initial position. He moves 4km east (to the right) and 3km north (upwards).

• A. 12 ms-1
• B. 13.3 ms-1
• C. 40 ms-1
• D. 48 ms-1

Explanation: To find the overall average speed, we use the formula: Average speed = Total distance / Total time.

• A. 5m/s
• B. 10m/s
• C. -5m/s
• D. 15m/s

Explanation: The relative velocity of the two cars with respect to one another can be found by adding their velocities.

• A. 12 ms-1
• B. 13.3 ms-1
• C. 48 ms-1
• D. 40 ms-1

Explanation: V - overall average speedS - a total distancet - a total timeV = S/tS = V1*t1 + V2*t2 + V3*t3V1, V2, V3 - average speeds for each gear…

• A. 2v
• B. √2v
• C. v
• D. v/√2

Explanation: c) v/√2 This option suggests that the average velocity of the man is v. This is the correct answer.

• A. 2.5
• B. 2.4
• C. 5
• D. 2.3

Explanation: We find out the average speed by using2v1v2/(v1+v2) = 12/5 = 2.4 km/h

• A. 10 sec
• B. 15 sec
• C. 20 sec
• D. 25 sec

Explanation: To calculateSpeed = 20m/sTotal distance = 100m +200m =300mTime = distance/speed = 300/20 =15s

• A. Volt/meter
• B. Newton/coulomb
• C. Joule/coulomb_meter
• D. All of above

Explanation: Therefore, the correct answer is "All of the above" since all the options are valid units for electric intensity, each expressing a…

• A. 1.6x10^-4
• B. 1.6x10^-8
• C. 1.6x10^-10
• D. 1.6x10^-11

Explanation: The force on an electron in an electric field can be calculated by using the formula:F = qEWhere 'q' is the charge of the electron.

• A. 240 NC-1
• B. 24 NC-1
• C. 2.4 NC-1
• D. 2400 NC-1

Explanation: As we know, Potential gradient is given by E= -dV/dR So, 12/0.005 = 2400 V/m= 2400 N/C