List of top Physics Questions

Convex lens forms the image of Sun at :
A bulb of 60 watt runs for 50 hours. How much electrical energy is consumed ?
Heating effect of current is used in :
Which of the following waves do not require any kind of medium to propagate ?
Inside a solenoid the magnetic field is :
Two objects of masses 1 kg and 3 kg have equal momentum. What is the ratio of their kinetic energies ?
Material used for making a fuse wire must have :
1 kWh = _____.
SI unit of universal gravitational constant (G) is :
1 Newton = ____ Dyne.
The human audible range of sound is from 20 Hz to ____ :
An object of mass 15 kg is moving with a uniform velocity of \(4 \text{ ms}^{-1}\). What is the kinetic energy possessed by the object ?
Relative density of silver is 10.8. The density of water is \(10^3 \text{ kg m}^{-3}\). Density of silver will be :
How does the force of gravitation between two objects change when the distance between them is reduced to half ?
Ultrasonic wave is a :
A sound wave has a frequency of 2 KHz and wavelength 35 cm. The time taken by it to travel a distance of 7 km will be :
Speed of sound in sea water at \(25^\circ\text{C}\) is :
The image formed by a concave mirror, when the object is placed between pole and focus :
Speed of light in vacuum is :
The minimum number of geostationary satellites required for uninterrupted global coverage is
If θ is the polarising angle for two optical media whose critical angles are C1 and C2 then the correct relation is
A person measures the depth of a well by measuring the time interval between dropping a stone and receiving the sound of impact with the bottom of the well. The error in his measurement of time is $\delta T =0.01$ seconds and he measures the depth of the well to be $L =20$ meters. Take the acceleration due to gravity $g =10\, ms ^{-2}$ and the velocity of sound is $300\, ms ^{-1}$. Then the fractional error in the measurement, $\delta L / L$, is closest to
A man holds a rectangular card in front of and parallel to a plane mirror. In order for him to see the entire image of the card, the least mirror area needed is:
A sinusoidal voltage of peak value $283\, V$ and angular frequency $320/s$ is applied to a series $LCR$ circuit. Given that $R = 5 \, \Omega , L = 25 \, mH $ and $C=1000 \, \mu F$. The total impedance, and phase difference between the voltage across the source and the current will respectively be :
The acceleration due to gravity at a height $1\, km$ above the earth is the same as at a depth $d$ below the surface of earth. Then :