List of top Physics Questions

Suppose the acceleration due to gravity at the earth's surface is g m/s\(^2\) and at the surface of moon it is g' m/s\(^2\). An M kg passenger goes from the earth to the moon in a spaceship moving with a constant velocity (Neglect all other objects in the sky). Which curve best represents the weight (net gravitational force) as a function of time?
Imagine a new planet having the same density as that of the earth, but it is two times bigger than the earth in size. If the acceleration due to gravity on the surface of the new planet is g' and that on the surface of the earth is g, then
If the earth were to suddenly contract to half of its present radius, what would be the duration of the day?
The angular momentum of a moving body remains constant, if
A horizontal force of 5 N is applied on a stationary body of mass 5 kg, which is initially at rest on a frictionless table. The change in kinetic energy of the body in 10 s is
Two bodies with kinetic energies in the ratio of 3:1 are moving with equal linear momentum. The ratio of their masses is
A mass M is hung with a light inextensible string as shown in figure. Find the tension of the horizontal string.
A man weighs 80 kg. He stands on a weighing scale in a lift which is moving upwards with a uniform acceleration of 6 m/s\(^2\). What would be his weight in kg? (g = 10 m/s\(^2\))
Two bodies are projected with the same velocity. If one is projected at an angle of 30\(^{\circ}\) and the other at 45\(^{\circ}\) to the horizontal, then the ratio of maximum heights attained is
Match the physical quantities given in List-I with dimensions expressed in terms of mass (M), length (L), time (T) and electric current (A) given in List-II.
Codes:
Which of the following circuits is correct for verification of Ohm's law?
From the graph of angle of deviation versus angle of incidence for an equilateral prism, the refractive index of material of prism is
In which of the following figures, diode is reverse biased?
An n-type and p-type semiconductor can be obtained by respectively doping pure silicon with
An electron transition takes place from excited state to ground state in hydrogen atom, then
In Young's double slit experiment, how many maxima can be seen on a screen (including central maxima) if d = \(\frac{5\lambda}{2}\) (where \(\lambda\) is wavelength of light and d is distance between the two slits).
What range of electromagnetic spectrum is considered as light?
The critical angle for a monochromatic light going from medium A to medium B is \(\theta\). If the speed of light in medium A is V, then the speed of light in medium B is
The incorrect statement about refractive index for a pair of media is
The direction of a ray of light incident on a concave mirror is shown by PQ, while direction in which the ray would travel after reflection is shown by four rays marked as A, B, C and D as shown in the figure. Which of the four rays correctly shows the direction of the reflected ray?
With reference to the figure shown below, match the following:
Match the following Maxwell's equations: (The symbols used here have their usual meanings)
A light bulb rated 100 W is connected to an AC source of 220 V, 50 Hz. The rms current through the bulb is
In a circuit containing a pure resistor connected to an AC source,
In the figure shown, the conductor PQ of length \(l\) is moved from \(x = 0\) to \(x = b\) and then up to \(x = 2b\) with a constant velocity \(\vec{v}\). A uniform magnetic field \(\vec{B}\) is perpendicular to the plane of the paper and extends from \(x = 0\) to \(x = b\) and it is zero from \(x>b\). The magnitude of emf induced in the conductor is