All Free Physics MCQs with Answers

• A. 1440i+1080jV/m
• B. 1240i+1280jN/C
• C. 1440i+1080jN/C
• D. 1240i+1080jN/C

Explanation: The formula for the electric field strength is E=(K x Charge, Q)/distance2.

• A. An electric field.
• B. A magnetic field.
• C. Both magnetic and electric fields.
• D. Neither magnetic nor electric fields.

Explanation: An electric charge produces an electric field around it, and when the electric charge is in motion it causes a change in position of the…

• A. Controls the number of waves
• B. Controls the brightness of the spot formed
• C. Accelerates electrons
• D. Has positive potential with respect to the cathode

Explanation: The correct answer is B: The grid in a cathode ray oscilloscope controls the brightness of the spot formed on the screen.

• A. ΔV = Ed
• B. ΔV = E/d
• C. ΔV = E/qo
• D. E = d/ΔV

Explanation: The correct answer is Option A: ΔV = Ed. This formula is used to calculate the magnitude of the electric field (E) between two parallel…

• A. NmC-1
• B. Nm-2C-2
• C. Nm2C-1
• D. Nm2C-2

Explanation: Electric flux is defined as the product of the electric field and the area through which the field lines pass.

• A. Capacitance
• B. Potential difference between two points
• C. Intensity of electric field
• D. Resistance between two points

Explanation: Explanation:The workdone in moving a unit positive charge from one point to another against the electric field is equal to the potential…

• A. 9.6 x 10^-19 J
• B. 9.1 x 10^-19 J
• C. 1.6 x 10^-19 J
• D. 6.0 x 10^-19 J

Explanation: Explanation: Charge = q = 2e Potential difference = V = 3V Energy = E = ?As we know that, E = qV = (2e)(3V) = 6eV E = 6 (1.6 × 10-19) E =…

• A. 1.6 x 10^-19 J
• B. 125 J
• C. 125 x 10^-19 J
• D. 125 x 1.6 x 10^-19 J

Explanation: Electric Potential Energy = Electric Potential x ChargeCharge = 5 x 1.6 x 10-19 CElectric Potential Energy = 25V x (5 x 1.6 x 10-19) CThis…

• A. Germanium
• B. Silver
• C. Copper
• D. Platinum

Explanation: Resistivity (ρ), is resistance R of a specimen such as a wire, multiplied by its cross-sectional area A, and divided by its length 1ρ =…

• A. Atoms
• B. Molecules
• C. Electrons
• D. Ions

Explanation: A is incorrect In metals atoms are not in combined form they are in electron pool type arrangementB is incorrect In metals molecules do…

• A. Negative temperature coefficients
• B. Positive temperature coefficients
• C. Both A and B
• D. None of the above

Explanation: Substances with a negative temperature coefficient of resistance, such as germanium and silicon, experience a decrease in resistance as…

• A. Graphite has a layered structure
• B. In graphite, all valence electrons are tetrahedrally bound
• C. In graphite one of valence electron is free to move
• D. Graphite is soft and greasy bound

Explanation: Graphite conducts electricity whereas diamond does not because in diamond the carbon atoms are bonded to other carbon atoms and all the…

• A. X = A.B
• B. B X = A + B
• C. X = Ā.B̄
• D. X = Ā + B̄

Explanation: The Boolean expression given for a NAND gate is that of logical addition and it is opposite to the AND gate The Boolean algebra for AND…

• A. Option A
• B. Option B
• C. Option C
• D. Option D

Explanation: The NAND gate, or "NotAND" gate, is the combination of two basic logic gates, the AND gate, and the NOT gate, connected in series.

• A. 11
• B. 10
• C. 1.1
• D. 0.11

Explanation: The formula used for the gain in non inverting amplifier is given as: 1+(Feedback resistance/resistance of other resistor)…

• A. Because electron movement decrease with the increase of temperature
• B. Because metal ions oscillations hinder electron movement
• C. Because electron direction changes at high temperature
• D. Because they pass heat current through collision of electrons

Explanation: The correct option is B because metal ion oscillations hinder electron movement.

• A. 3 x 10^5 ms-1
• B. 3 x 10^3 ms-1
• C. 3 x 10^6 ms-1
• D. 3 x 10^8 ms-1

Explanation: Explanation:The speed of light, radio waves, and microwaves in the vaccum is the same, which is approximately 3 × 108 m/s.

• A. 2.45 GHz
• B. 2452 Hz
• C. 2456 Hz
• D. 2455 Hz

Explanation: The electromagnetic waves used in a microwave oven have a frequency of 2.45 x 10° Hz.

• A. 64 m/s
• B. 32 m/s
• C. 8 m/s
• D. 4 m/s

Explanation: Given that,d1=2md2=4mV1=16m/sV2=𝑥From flow rate,A1V1 =A2V2(πr2)1V1=(πr2)2V2(d12/4)V1=(d22/4)V2By substituting the given values,𝑥= V2 =…

• A. Bernoulli's equation
• B. Venturi meter
• C. Equation of motion
• D. Equation of continuity

Explanation: The correct answer is D) Equation of continuity, as it directly expresses the conservation of mass in fluid flow.