List of top Physics Questions

Two cells of emf \( E_1 \) and \( E_2 \), and internal resistances \( r_1 \) and \( r_2 \), respectively, are connected in parallel as shown in the figure. The equivalent emf of the combination is \( E_{\text{eq}} \). Then 

Which of the following is a correct statement?
Which of the following statements is not true?
The angle between the particle velocity and wave velocity in a transverse wave is (except when the particle passes through the mean position)
A gas is taken from state A to state B along two different paths 1 and 2. The heat absorbed and work done by the system along these two paths are \( Q_1 \) and \( W_1 \), and \( Q_2 \) and \( W_2 \), respectively. Then
At 27°C temperature, the mean kinetic energy of the atoms of an ideal gas is \( E_1 \). If the temperature is increased to 327°C, then the mean kinetic energy of the atoms will be
Two wires A and B are made of the same material. Their diameters are in the ratio 1:2 and lengths are in the ratio 1:3. If they are stretched by the same force, then increase in their lengths will be in the ratio of
If \( r_1, v_1, L_1 \) and \( r_2, v_2, L_2 \) are radii, velocities, and angular momenta of a planet at perihelion and aphelion of its elliptical orbit around the Sun respectively, then
The total energy of a satellite in a circular orbit at a distance \( (R + h) \) from the center of the Earth varies as
During an elastic collision between two bodies, which of the following statements are correct?
A body of mass 0.25 kg travels along a straight line from \( x = 0 \) to \( x = 2 \, \text{m} \) with a speed \( v = k x^2 \) where \( k = 2 \, \text{m}^{-1} \). The work done by the net force during this displacement is
Three particles of mass 1 kg, 2 kg, and 3 kg are placed at the vertices A, B and C respectively of an equilateral triangle ABC of side 1 m. The centre of mass of the system from vertices A (located at origin) is
Two stones begin to fall from rest from the same height, with the second stone starting to fall \( t_1 \) seconds after the first falls from rest. The distance of separation between the two stones becomes \( H \) after the first stone starts its motion. Then \( t_1 \) is equal to:
In the projectile motion of a particle on a level ground, which of the following remains constant with reference to time and position?
The range of electrical conductivity \( \sigma \) and resistivity \( \rho \) for metals, among the following, is:
In determining the refractive index of a glass slab using a travelling microscope, the following readings are tabulated:
(a) Reading of travelling microscope for ink = 8.123 cm
(b) Reading of travelling microscope for ink through glass slab = 6.123 cm
(c) Reading of travelling microscope for chalk dust on glass slab = 8.123 cm
From the data, the refractive index of a glass slab is:}
Which of the following statements is correct for an n-type semiconductor?
A ray of light passes from vacuum into a medium of refractive index \( n \). If the angle of incidence is twice the angle of refraction, then the angle of incidence in terms of refractive index \( n \) is
If the radius of the first Bohr orbit is \( r \), then the radius of the second Bohr orbit will be
The image formed by an objective lens of a compound microscope is
The total energy carried by the light wave when it travels from a rarer to a non-reflecting and non-absorbing medium
A sinusoidal voltage produced by an AC generator at any instant \( t \) is given by an equation \( V = 311 \sin (314t) \). The rms value of voltage and frequency are respectively
In domestic electric mains supply, the voltage and the current are
Match the following types of waves with their wavelength ranges
If we consider an electron and a photon with the same de-Broglie wavelength, then they will have the same