List of top Physics Questions

A bullet fired into a fixed target loses half of its velocity after penetrating $3\,cm$. How much further it will penetrate before coming to rest, assuming that it faces constant resistance to motion ?
The upper half of an inclined plane with inclination $\phi$ is perfectly smooth, while the lower half is rough. A body starting from rest at the top will again come to rest at the bottom, if the coefficient of friction for the lower half is given by:
In a common base amplifier, the phase difference between the input signal voltage and output voltage is:
If the equation of motion of standing waves is $y=0.3 \sin (314\, t-1.57\, x)$, then the velocity of standing wave will be :
A black body is heated from $27^{\circ} C$ to $927^{\circ} C$ the ratio of radiations emitted will be :
A boy of $50\, kg$ is standing in a left moving down with acceleration $ 9.8\,m/s^{2}$ . The apparent weight of the boy is:
The weight of an object at earth's surface is $700\, g\, wt$. What will be its weight at the surface of a planet whose radius is $1 / 2$ and mass is $1 / 7$ of that of the earth ?
Out of the given bodies (of same mass) for which the moment of inertia will be maximum about the axis passing through its centre of gravity and perpendicular to its plane?
The velocity of all radio waves in free space is $3 \times 10^{8} m / s$. The frequency of a radio wave of wavelength $150\, m$ is :
A $120\, m$ long train is moving towards west with a speed of $10\, m / s$. A bird flying towards east with a speed of $3\, m / s$ crosses the train. The time taken by the bird to cross the train will be :
Core of a transformer is made up of:
A nuclear transformation is denoted by $X\left(n, \alpha\right) \,^{7}_{3}Li.$ Which of the following is the nucleus of element $X$ ?
Limit of resolution of a telescope is $4.88 \times 10^{-6}$ rad for light of wavelength 560 nm. Diameter of the objective is
Two coherent monochromatic; light beams of intensities $I$ and $4I$ are superposed. Intensities at constructive and? destructive interferenc positions will be
An ideal gas is taken from point $ A $ to the point $ B $ , as shown in the $ p-V $ diagram, keeping the temperature constant. The work done in the process is :
A Carnot engine whose low temperature reservoir is at $ 7^??, C $ has an efficiency of $ 50\% $ . It is desired to increase the efficiency to $ 70\% $ . By how many degrees should the temperature of the high temperature reservoir be increased ?
A moving coil galvanometer has a resistance of $ 10\, O $ and full scale deflection of $ 0.01\, A $ . It can be converted into voltmeter of $ 10\, V $ full scale by connecting into resistance of :
In Young?? double slit experiment, the slits are $ 3 \,mm $ apart. The wavelength of light used is $ 5000\, ??$ and the distance between the slits and the screen is $ 90 \,cm $ . The fringe width in $ mm $ is :
A circular disc of radius $ R $ rolls without slipping along the horizontal surface with constant velocity $ v_0 $ . We consider a point $ A $ on the surface of the disc. Then the acceleration of the point $ A $ is :
$ 1\,Wb/m^2 $ is equal to :
The number of free electrons per $ 100 \,mm $ of ordinary copper wire is $ 2 ??10^{21} $ . Average drift speed of electrons is $ 0.25\, mm/s $ . The current flowing is :
Find the dimensions of electric permittivity.
A person is standing in an elevator. In which situation he finds his weight less?
The radius of sphere is measured to be $ (2.1\,\pm \,0.5)\,cm. $ Calculate its surface area with error limits:
A block of mass $m$ initially at rest is dropped from a height $h$ on to a spring of force constant $k$. The maximum compression in the spring is $x$ then: