List of top Physics Questions

An alternating voltage V = 140 sin 100 πt is connected across a pure resistor of resistance 40 Ω. What is the rms current through the resistor? (Take √2 = 1.4)

SI unit of temperature is ________.

A conducting sphere of radius R is given a charge Q. What is the electric field and the electric potential at the centre of the sphere?

Which amongst the following is not a type of lense ?

In a series LCR circuit an ac voltage source is connected. When inductor is removed from the circuit, the phase difference between the voltage and the current in the circuit is \(\frac{π}{3}\). If capacitor is removed from the circuit instead of inductor, the phase difference is again \(\frac{π}{3}\). What is the power factor of the circuit?

The correct curve between stopping potential \( V_0 \) and intensity of incident radiation \( I \) at constant frequency is:

A slit of width \(e\) is illuminated by light of wavelength \(\lambda\). What should be the value of \(e\) to obtain the first maximum at an angle of diffraction \(\frac{\pi}{3}\)?

The truth table for one of the following logic gates is given. Identify the logic gate

The statement that is NOT true about induced emf is:

Which of the following statements are correct?
(A) The resistivity of a semiconductor decreases with increasing temperature.
(B) The potentiometer is unaffected by the internal resistance of the source.
(C) In ionic crystals and electrolytic liquids electrons carry the electric current.
(D) Ohm's law fails if V depends on I non-linearly.
(E) Kirchhoff's rules are used for analysis of electric circuits.
Choose the correct answer from the options given below:

For a glass prism (μ= √3), the angle of minimum deviation is equal to the angle of prism. What is the angle of prism?

The correct mathematical expression for amplitude modulated wave is:

Light from a point source in air falls on spherical glass surface (n = 1.4 and radius of curvature 20 cm). The distance of light source from the glass surface is 150 cm, At what position is the image formed?

Why do light emitting diodes are preferred over conventional incandescent low power lamps?

Which of the following statements is NOT correct:

In Young's double slit experiment, yellow light of wavelength 640 nm produces fringes of width 0.8 mm. What will be the fringe width if the light source is replaced by another monochromatic source of wavelength 720 nm and the separation between the slits is made thrice?

A bulb of 100 W glows for 6 hours a day. The units of energy consumed in 7 days would be :

Choose the correct statements from the following:
A. Induced emf opposes any change in the current in a circuit
B. Induced emf in a closed coil can be increased by increasing the number of turns in the coil
C. Varying current in a coil can not induce emf in a neighbouring coil.
D. An LCR circuit has zero impedance at resonant frequency
E. Average power supplied to an inductor over one complete cycle is zero
Choose the correct answer from the options given below:

If x is inversely proportional to y and y is directly proportional to z, then xz is :

Six equal resistances are connected between points P, Q and R as shown in the figure. The net resistance will be maximum between:

Choose the correct answer from the following:
If three charged particles are collinear and are in equilibrium, then:

What is the de Broglie wavelength associated with an elector accelerated through a potential difference of 144 V?

Which of the following statements are correct?
A. Photoelectric current depends on the intensity of light.
B. The stopping potential is directly related to the maximum kinetic energy of electrons emitted, which is dependent on the intensity of incident radiation.
C. Photoelectric emission from a metal surface occurs due to absorption of a photon by an electron.
D. Photoelectric effect follows the law of conservation of energy.

A room heater is rated 750 W, 220 V. An electric bulb rated 200 W, 220 V is connected in series with this heater. What will be the power consumed by the bulb and the heater respectively, when the supply is at 220 V?

1 atm (Atmospheric Pressure) is equal to :