List of practice Questions

The primary of a transformer has 400 turns while the secondary has 2000 turns. If the power output from the secondary at 1000 V is 12 kW, what is the primary voltage ?
A Cylinder rolls down an inclined plane of inclination 30°, the acceleration of cylinder is
A gymnst takes turns with her arms & legs stretched. When she pulls her arms & legs in
Escape velocity when a body of mass m is thrown vertically from the surface of the earth is v, what will be the escape velocity of another body of mass 4m is thrown vertically
A metallic bar is heated from 0 °C to 100 °C. The coefficient of linear expansion is 10-5K-1. What will be the percentage increase in length ?
A graph is plotted with PV/T on y-axis and mass of the along x-axis for different gases. The graph is
Resonance frequency of LCR series a.c. circuit is f0. Now the capacitance is made 4 times, then the new resonance frequency will become.
If \(\vec{E}\) and \(\vec{B}\) represent electric and magnetic field vectors of the electromagnetic waves, then the direction of propagation of the waves will be along
1000 N force is required to lift a hook and 10000 N force is requires to lift a load slowly. Find power required to lift hook with load with speed v = 0.5 m/sec
For nuclear reaction, select correct statement for released energy
Density of sea water is more than that of fresh water then for a boat floating. What will be true
If minimum deviation = 30° then speed of light in prism
Triangle with angle 60
What is the ratio of speed of wave in medium 1 and 2 ?
Wave length
If speed of sound in air is 340 m/s and in water 1480 m/s. If frequency of sound is 1000 kHz then find wavelength in water.
Loudness of sound defines on
A mass of 200 gm has initial velocity \(v_i = 2\hat{i}+3\hat{j}\) and final velocity \(v_f=-2\hat{i}-3\hat{j}\) find magnitude of change in momentum
A spring of spring constant k is cut into 3 equal part find k of each
A nuclear of mass number A emits a particle speed of a particle is v then what is recoil speed of nuclease.
Fermer bone has base n average cross section area 100 cm2 supporting mass of 40 kg of man find average pressure
Two wave in string have same velocity. If linear mass density of string are μ1 = 5, μ2 = 20 T1 = 40 then , T2 = ?
If 2 wire of length L1 and L2 and Young's modulus Y1 and Y2 are in series then effective Young's modulus is
A positive charge particle is released in electric field in case (a) it is just released and in case (b) it has initial speed v0 along electric field. If after sometime its kinetic energy in case (a) and (b) are k1 and k2 then,
Which of the following represents isotope, isobar isotones respectively ?
If accelerating voltage of X-ray tube is 13 kV find minimum wavelength of X-ray,
Two concentric circular coil of radius 20 cm and 30 cm carries current 2A and 3A respectively in opposite direction then magnetic field at centre will be :-