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A thin rod of mass 0.9 kg and length 1 m is suspended

A thin rod of mass 0.9 kg and length 1 m is suspended, at rest, from one end so that it can freely oscillate in the vertical plane. A particle of... View Article

A body of mass 2 kg is driven by an engine delivering a constant power of 1 J/s

A body of mass 2 kg is driven by an engine delivering a constant power of 1 J/s. The body starts from rest and moves in a straight line. After 9... View Article

A prism of angle A = 1° has a refractive index μ = 1.5. A good estimate for the minimum angle of deviation (in degrees) is close to N / 10. Value of N is

Answer: 5 A = 1° δ = (μ – 1) A = (1.5 – 1) A = 0.5 × 1 = 5 / 10 = N / 10 so N = 5... View Article

The surface of a metal is illuminated alternately with photons of energies

The surface of a metal is illuminated alternately with photons of energies E1 = 4 eV and E2 = 2.5 eV respectively. The ratio of maximum speeds of... View Article

Nitrogen gas is at 300° C temperature. The temperature (in K) at which the rms speed of a H₂ molecule would be equal to the rms speed of a nitrogen molecule, is

Answer: 41 Vrms = √(3RT / M) √(3RT / 2) = √([3R * 573] / 28) T / 2 = 573 / 28 T = 41 K... View Article

The acceleration due to gravity on the earth’s surface

The acceleration due to gravity on the earth’s surface at the poles is g and angular velocity of the earth about the axis passing through... View Article

The quantities x = 1 / √μ₀ε₀, y = E / B and z = L / CR are defined where C – capacitance, R – Resistance, L – length, E – Electric field, B – magnetic field and ε₀, μ₀ – free space permittivity and permeability respectively. Then:

1) Only y and z have the same dimension 2) x, y and z have the same dimension 3) Only x and y have the same dimension 4) Only x and z have the... View Article

Two coherent sources of sound, S₁ and S₂, produce sound waves of the same wavelength

Two coherent sources of sound, S1 and S2, produce sound waves of the same wavelength, λ = 1 m, in phase. S1 and S2 are placed 1.5 m apart... View Article

An iron rod of volume 10^–3m³ and relative permeability 1000 is placed as core in a solenoid with 10 turns/cm.

An iron rod of volume 10–3m3 and relative permeability 1000 is placed as core in a solenoid with 10 turns/cm. If a current of 0.5 A is... View Article

A driver in a car, approaching a vertical wall

A driver in a car, approaching a vertical wall, notices that the frequency of his car horn has changed from 440 Hz to 480 Hz when it gets... View Article

A radioactive nucleus decays by two different processes

A radioactive nucleus decays by two different processes. The half-life for the first process is 10 s and that for the second is 100 s. The... View Article

A parallel plate capacitor has a plate of length l

A parallel plate capacitor has a plate of length ‘l’, width ‘w’ and separation of plates is ‘d’. It is... View Article

In the circuit shown, charge on the 5μF capacitor is

In the circuit shown, charge on the 5μF capacitor is: 1) 5.45 μc 2) 18.00 μc 3) 10.90 μc 4) 16.36 μc Answer: (4) (V... View Article

A galvanometer is used in the laboratory for detecting the null point in electrical experiments. If on passing a current of 6 mA it produces a deflection of 2°, its figure of merit is close to:

1) 6 × 10–3 A/div. 2) 3 × 10–3 A/div. 3) 666° A/div. 4) 333° A/div. Answer: (2) Figure of merit = I /... View Article

In an adiabatic process, the density of a diatomic gas becomes 32 times its initial value. The final pressure of the gas is found to be n times the initial pressure. The value of n is:

1) 32 2) 1 / 32 3) 326 4) 128 Answer: (4) PVγ = constant p (⍴-γ) = constant p1(ρ1-γ) = p2 (ρ2-γ) γ =... View Article

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