List of top Physics Questions

A bomb of mass 30kg at rest explodes into two pieces of masses 18kg and 12kg. The velocity of 18kg mass is 6ms^-1. The kinetic energy of the other mass is

Average density of the earth :

If the potential difference across the internal resistance $r_1$ is equal to the emf $E$ of the battery, then

Four metal conductors having different shapes a) a sphere b) cylindrical c) pear d) Lightening conductor are mounted on insulating stands and charged. The one which is best suited to retain the charge for a longer time is

By using only two resistance coils-singly, in series, or in Parallel-one should be able to obtain resistances of $3, 4, 12$ and $16$ ohms. The separate resistances of the coil are

The magnitude of $I$ in ampere unit is

A heavy brass sphere is hung from a weightless inelastic spring and as a simple pendulum its time period of oscillation is T. When the sphere is immersed in a non-viscous liquid of density 1/10 that of brass, it will act as a simple pendulum of period :

The relation between time $t$ and distance $x$ is $t = ax^2 + bx$, where $a$ and $b$ are constants. The acceleration is:

A cylindrical bar magnet is kept along the axis of a-circular coil. If the magnet is rotated about its axis, passing through the centre, perpendicular to the face, then:

Core of a transformer is made up of:

Out of the following four dimensional quantities, which one qualifies to be called a dimensional constant ?

The wavelength of the radiation emitted by a body depends upon

Which mirror is to be used to obtain a parallel beam of light from a small lamp?

When a body falls in air, the resistance of air depends to a great extent on the shape of the body. $3$ different shapes are given. Identify the combination of air resistances which truly represents the physical situation. (The cross sectional areas are the same)

1. Disc 2. Ball 3. cigar sheped

The induction coil works on the principle of

Consider a short magnetic dipole of magnetic length 10 cm. Its geometric length is

Two perfect gases at absolute temperatures $T_1$ and $ T_2$ are mixed. There is no loss of energy. The temperature of mixture of masses of molecules are $ m_1$ and $ m_2$ and the number of molecules in the gases are $n_1 $ and $ n_2 $ respectively, is

The binding energy of a satellite of mass m in a orbit of radius r is (R = radius of earth, g = acceleration due to gravity)

Angular velocity of hour hand of a watch is

At constant pressure, which of the following is true ?

Direction of magnetic field at equatorial point is

A coin placed on a rotating turntable just slips, if it is placed at a distance of $8\, cm$ from the centre. If angular speed of the turntable is doubled, it will just slip at a distance of:

The .examples of diamagnetic, paramagnetic and ferromagnetic materials are respectively:

The material used in the manufacture of cooker must have (k - coefficient of thermal conductivity, s - specific heat of material used)

20 amp current is flowing in a long straight wire. The intensity of magnetic field at a distance of 10 cm from the wire, will be: