A 500 J
B 50 J
C 100 J
D 1000 J
Explanation: PE = mgh = 5 × 10 × 10 = 500 J
A 4 m/s
B 8 m/s
C 12 m/s
D 16 m/s
Explanation: v = u + (F/m)t = 4 + (12/3)(1) = 4 + 4 = 8 m/s
A 1 s
B 2 s
C 4 s
D 0.5 s
Explanation: T = 2π√(L/g) = 2π√(1/π²) = 2π/π = 2 s
A Tangential to the circle
B Along the radius towards center
C Away from the center
D Perpendicular to the plane
Explanation: In uniform circular motion, centripetal acceleration is always directed towards the center of the circle.
Explanation: KE = p²/2m, so KE/p = p/2m = mv/2m = v/2
A 0.5 m
B 1 m
C 2 m
D 10 m
Explanation: k = 2π, so λ = 2π/k = 2π/2π = 1 m
A Doppler effect
B Diffraction
C Resonance
D Interference
Explanation: The apparent change in frequency of a wave due to relative motion between source and observer is the Doppler effect.
A 340 m/s
B 300 m/s
C 400 m/s
D 3 × 10⁸ m/s
Explanation: The speed of sound in air at standard temperature and pressure is approximately 340 m/s
A Real and erect
B Virtual and erect
C Real and inverted
D Virtual and inverted
Explanation: A plane mirror always forms a virtual, erect image of the same size as the object.
A 2 × 10⁸ m/s
B 1.5 × 10⁸ m/s
C 4.5 × 10⁸ m/s
D 3 × 10⁸ m/s
Explanation: v = c/n = (3 × 10⁸)/1.5 = 2 × 10⁸ m/s
A Force × distance
B Work × time
C Work / time
D Force / time
Explanation: Power is the rate of doing work, P = W/t
A 9.8 m/s²
B 1.6 m/s²
C 3.3 m/s²
D 6.7 m/s²
Explanation: Gravity on the Moon is approximately 1/6 of Earth\'s gravity ≈ 1.6 m/s²
A Path taken
B Displacement only
C Speed of body
D Mass only
Explanation: Gravitational force is conservative, so work done depends only on the initial and final positions (displacement).
A Voltmeter
B Galvanometer
C Electric motor
D Ammeter
Explanation: The force on a current-carrying conductor in a magnetic field is the principle behind the working of an electric motor.
A 9 Ω
B 2 Ω
C 18 Ω
D 4.5 Ω
Explanation: In series, R = R₁ + R₂ = 3 + 6 = 9 Ω
A 30 W
B 9 W
C 90 W
D 3 W
Explanation: P = I²R = 3² × 10 = 9 × 10 = 90 W
A Ampere
B Coulomb
C Volt
D Ohm
Explanation: Charge Q = It, so the SI unit is Coulomb (C)
A 3 A
B 48 A
C 0.33 A
D 8 A
Explanation: I = V/R = 12/4 = 3 A
A 50 J
B 2 J
C 5 J
D 0.5 J
Explanation: W = QV = 5 × 10 = 50 J
A 42000 J
B 21000 J
C 84000 J
D 10500 J
Explanation: Q = mcΔT = 2 × 4200 × 5 = 42000 J