List of top Physics Questions

Which of the following is fusion?
A \(e^-\) when accelerated by \(V\) volts experiences a force \(F\) when it enters a uniform magnetic field. What will the force experience when it is accelerated by \(2V\) volts ?
If the efficiency of the engine is 50%, and its work output is 500 J. Find input?
Find I in shown figure
Find I in shown figure
A current is flowing through the wire of diameter \(d\) having drift velocity of electron \(v_d\) in it. What will be new drift velocity when diameter of wire is made \(\frac d4\) ?
A force of 10 N acts on a body of mass 0.5 kg for 0.25 sec starting from rest. What is its momentum now?
How much intense is 80 db sound in comparison to 40 dB?
In adiabatic conditions, 2 mole of \(CO_2\)gas at 300 K is expanded such that its volume becomes 27 times. Then, the work done is
(\(C_v=6 \ cal\ mol^-\) and \(γ = 1.33\))
Number of photons emitted by a 100 W (Js-1) yellow lamp in 1.0 s is
(λ of yellow light is 560 nm)
The transfer ratio β of transistor is 50. The input resistance of a transistor when used in C.E (common emitter) configuration is 1 kΩ. The peak value of the collector A.C current for an A.C. input voltage of 0.01 V peak is
The molecules of a given mass of gas have a root mean square velocity of 200 ms-1 at 27°C and 1.0 × 105 N m-2 pressure. When the temperature is 127°C and the pressure 0.5 × 105 N m-2, the root mean square velocity in ms-1 is
The first line of Balmer series has wavelength 6563 Å. What will be the wavelength of the first member of Lyman series
A spherical black body with a radius of 12 cm radiates 450 watt power at 500 K. If radius were halved and the temperature doubled, the power radiated in watt would be :
The following figure shows a logic gate circuit with two inputs A and B and the output Y. The voltage waveforms of A, B and Y are given
Logic gate and timing diagram
The logic gate is
The figure shows elliptical orbit of a planet m about the sun S. The shaded area SCD is twice the shaded area SAB. If t1 is the time for the planet to move from C to D and t2 is the time to move from A to B then :
elliptical orbit of a planet m about the sun S
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 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 ?
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 gymnst takes turns with her arms & legs stretched. When she pulls her arms & legs in
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
A graph is plotted with PV/T on y-axis and mass of the along x-axis for different gases. The graph is
A Cylinder rolls down an inclined plane of inclination 30°, the acceleration of cylinder is
For nuclear reaction, select correct statement for released energy
If minimum deviation = 30° then speed of light in prism
Triangle with angle 60