Physics Test - ...

A metal surface is illuminated by the light of given intensity and frequency to cause photoemission. If the intensity of illumination is reduced to one fourth of its original value then the maximum KE of the emitted photoelectrons would be

A force (F) = acting on a particle causes a displacement (s) = in its own direction. If the work done is 14 J, then the value of ‘a ’is

Light of wavelength ‘λ‘is incident on a single slit of width 'a ', and the distance between slit and screen is ‘D ’. In diffraction pattern, if slit width is equal to the width of the central maximum, then 'D ’is equal to

A stretched string fixed at both ends has 'm' nodes, then the length of the string will be

Three identical rods each of mass ‘M’ and length ‘L’ are joined to form a symbol ‘H’. The moment of inertia of the system about one of the sides of 'H’ is

A block of mass ‘m ’moving on a frictionless surface at speed V collides elastically with a block of the same mass, initially at rest. Now the first block moves at an angle 'θ’ with its Initial direction and has speed ‘v₁ ’. The speed of the second block after the collision is

Two pendulums begin to swing simultaneously. The first pendulum makes nine full oscillations when the other makes seven. The ratio of the lengths of toe two pendulums is

Which one of the following statements is correct?

A wire of length ‘L’ and area of cross section ‘A' is made of material of Young’s modulus ‘Y’. It is stretched by an amount 'x'. The work done in stretching the wire is

An aircraft is moving with uniform velocity 150 m/s in space. If all the forces acting on it are balanced, then it will

A conveyor belt is moving at a constant speed of 2 m/s. A box is gently dropped on it. The coefficient of friction between then is µ= 0.5. The distance that the box will move relative to belt before coming to rest on it, taking g = 10 ms^–2  is

The force ‘F’ acting on a body of density ‘d’ are related b y the relation F = y/√d. The dimensions of 'y' are

The dimensions of self or mutual inductance/ are given as

Magnetic susceptibility of a paramagnetic substance is

A simple harmonic progressive wave Is represented as y = 0.03 sin π(2t - 0.01x) m. At a given Instant of time, the phase difference between two particles 25 m apart Is

The magnetic dipole moment of a short magnetic dipole at a distant point along the equator of magnet has a magnitude of ‘X’ in SI units, tf the distance between the point and the magnet is halved then the magnitude of dipole moment win be

If ‘x’, ‘v’ and 'a' denote the displacement, velocity and acceleration of a particle respectively executing SHM of periodic time t, then which one of die following does not change with time?