CUET - Physics Mock Tests

An ideal gas undergoes a Carnot cycle between temperatures T₁ = 500 K and T₂ = 300 K. In one cycle, the gas absorbs 100 J of heat from the hot reservoir. The work done by the gas in one cycle is:

B = μ₀I/(2πr) = (4π × 10⁻⁷)(10)/(2π × 0.1) = 40π × 10⁻⁷/(0.2π) = 200 × 10⁻⁷ = 2 × 10⁻⁵ T.

A long straight wire carries a current of 5 A. The magnetic field at a distance of 10 cm from the wire is: (μ₀ = 4π × 10⁻⁷ T·m/A)

An AC voltage V = 200 sin(100t) is applied across a resistor of 100 Ω. The rms current through the resistor is:

A mass-spring system oscillates with angular frequency ω₀ on a horizontal frictionless surface. The spring constant is k and the mass is m. If the amplitude is doubled, the average kinetic energy over one period:

An AC source of 200 V rms supplies a circuit with a rms current of 10 A. If the power consumed in the circuit is 1 kW, the power factor of the circuit is:

A sound source moves toward a stationary observer with speed v_s. The observer also moves toward the source with speed v_o. If v_s = v_o = v/4 (v = speed of sound), the apparent frequency is:

A block slides down a frictionless incline of angle 30° and length 10 m. The time taken to reach the bottom is: (g = 10 m/s²)