All Free Physics MCQs with Answers

• A. 1
• B. 2
• C. 3
• D. 4

Explanation: Given,Area= circumference πr² = 2πrCutting π and r on both sidesr = 2

• A. bar
• B. atm
• C. Pascal
• D. erg

Explanation: Fact. According to the formula Pressure=Force/Area 1 N/m2 = 1 Pascal

• A. 1/24 x 1/60 x 1/60 of a mean solar day
• B. The second as defined by the electronic digital watch
• C. Duration of 9,192,631,770 vibrations of a cesium-133 atom
• D. Minute

Explanation: The SI unit of time is the second, symbolized as 's'. The modern definition is based on the cesium-133 atom's vibrations: specifically…

• A. 1.7588×10^19 Coulomb
• B. 1.6022×10^-19 Coulomb
• C. 1.2057×10^19 Coulomb
• D. 0.6022×10^19 Coulomb

Explanation: 1.6022×10^-19 Coulomb: This option is correct. The charge of an electron is approximately -1.6022×10^-19 Coulomb.

• A. Weber
• B. Weber meter^-2
• C. Tesla
• D. Henry

Explanation: Henry is the SI unit of inductance, symbolized by the letter H.

• A. 4/3 π radian
• B. 4/3 π steradian
• C. 4 π radian
• D. 4 π streradian

Explanation: One steradian is the solid angle of a sphere subtended by a portion of the surface whose area is equal to the square of the sphere's…

• A. 50 mA
• B. 50 µA
• C. 500 mA
• D. 500 µA

Explanation: The current of 0.05 A can be expressed as 50 mA because 'milli' means one thousandth, making 0.05 A equivalent to 50 milliamperes.

• A. 104
• B. 109
• C. 10-6
• D. 1012

Explanation: Tera donates multiplication by one trillion or 10¹².OPTION A: The prefix "myria" OPTION B: The prefix "Giga" stands for 10^9.OPTION C: The…

• A. Mass, acceleration, temperature, kinetic energy
• B. Mass, volume, electrical potential, kinetic energy
• C. Acceleration, temperature, volume, electric charge
• D. Momentum, electric intensity, density, magnetic flux.

Explanation: A scalar quantity contains only magnitude and no direction, making options B the correct answer.

• A. Kg m s-1
• B. Kg m-1 s-2
• C. Kg m2 s-2
• D. Kg m-2 s-1

Explanation: Pressure is calculated as force per unit area. In this case, the correct unit of pressure is Kg m-1 s-2.

• A. 0.01 m
• B. 0.1 m
• C. 1 m
• D. 100 m

Explanation: The correct answer is 1 meter because a yard is approximately 0.9144 meters, making 1 meter the closest option.

• A. 1um
• B. 1mm
• C. 1pm
• D. 1fm

Explanation: 1nm×1km=(10−9m)×(103m)=10−6m21 μm=10−6 m1nm×1km=1μm

• A. 71 Newton
• B. 12mu s
• C. 8 Kg
• D. 43 kg m-3

Explanation: Option d is correct because it follows the standard convention for writing units in the International System of Units (SI).

• A. Pascal
• B. mmHg
• C. torr
• D. atm

Explanation: The Pascal (Pa) is the SI unit of pressure, defined as one newton per square meter (N/m²).

• A. 2.5
• B. 25
• C. 250
• D. 2500

Explanation: Current gain is the ratio of the change in the collector current to the change in the emitter current in a transistor.

• A. Nonviolent
• B. Divalent
• C. Trivalent
• D. Pentavalent

Explanation: A p-type crystal is formed when a semiconductor crystal, such as Germanium (Ge) or Silicon (Si), is doped with an impurity that has one…

• A. Vallage amplifier
• B. Oxillator
• C. Current amplifier
• D. Rectifier

Explanation: A Transistor is a device which consists of three regions of doped semiconductors in which the current flowing is modulated by the voltage…

• A. Reversed biased
• B. Forward biased
• C. Neutral
• D. None of these

Explanation: In a transistor, the emitter to base function is forward-biased. A transistor is a three-terminal semiconductor device that can amplify or…

• A. Amplification
• B. Biasing
• C. Modulation
• D. Doping

Explanation: Biasing is the application of DC voltage to set up certain operating conditions.

• A. forward voltage
• B. reverse current
• C. forward current
• D. type of semiconductor

Explanation: LEDs are semiconductors that convert electrical energy into light energy.