List of top Physics Questions

The equilibrium state of a thermodynamic system is described by:
A. Pressure
B. Total heat 
C. Temperature 
D. Volume 
E. Work done
Choose the answer from the options given below.

A box of mass 5 kg is pulled by a cord, up along a frictionless plane inclined at 30° with the horizontal. The tension in the cord is 30 N. The acceleration of the box is (Take g = 10 m s^–2)

Let us consider two solenoids A and B, made from same magnetic material of relative permeability \(µ_r\) and equal area of cross-section. Length of A is twice that of B and the number of turns per unit length in A is half that of B. The ratio of self inductances of the two solenoids, LA : LB is

When the output of an OR gate is applied as input to a NOT gate, then the combination acts as a

Interference pattern can be observed due to superposition of the following waves:
A. \(y = a \sin \omega t\)     B. \(y = a \sin 2\omega t\)
C. \(y = a \sin(\omega t - \phi)\)      D. \(y = a \sin 3\omega t\)
Choose the correct answer from the options given below.

A particle executing simple harmonic motion with amplitude A has the same potential and kinetic energies at the displacement

Two slits in Young’s double slit experiment are 1.5 mm apart and the screen is placed at a distance of 1 m from the slits. If the wavelength of light used is \(600 \times 10^{-9}\, \text{m}\), then the fringe separation is:

Water is used as a coolant in a nuclear reactor because of its

A uniform metal wire of length \(l\) has 10 Ω resistance. Now this wire is stretched to a length \(2l \) and then bent to form a perfect circle. The equivalent resistance across any arbitrary diameter of that circle is :

The spectral series which corresponds to the electronic transition from the levels n₂ = 5, 6,… to the level n₁ = 4 is

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Houses made of concrete roofs overlaid with foam keep the room hotter during summer.
Reason R: The layer of foam insulation prohibits heat transfer, as it contains air pockets.
In the light of the above statements, choose the correct answer from the options given below.

Given below are two statements:
Statement 1: Image formation needs regular reflection and/or refraction.
Statement 2: The variety in colour of objects we see around us is due to the constituent colours of the light incident on them.
In the light of the above statements, choose the most appropriate answer from the options given below :

The I-V characteristics shown above are exhibited by a:

The capacitance of a capacitor with charge q and a potential difference V depends on :

The radius of gyration of a solid sphere of mass \(5 \, \text{kg}\) about \(XY\) is \(5 \, \text{m}\) as shown in figure.
The radius of the sphere is \(\frac{5x}{\sqrt{7}} \, \text{m}\), then the value of \(x\) is:

The magnetic moment and moment of inertia of a magnetic needle as shown are, respectively, \(1.0 \times 10^{-2} \, \text{A} \, \text{m}^2\) and \(\frac{10^{-6}}{\pi^2} \, \text{kg} \, \text{m}^2\). If it completes 10 oscillations in 10 s, the magnitude of the magnetic field is:

A particle is moving along x-axis with its position (\(x\)) varying with time (\(t\)) as:
\[ x = \alpha t^4 + \beta t^2 + \gamma t + \delta. \]
The ratio of its initial velocity to its initial acceleration, respectively, is:

A step up transformer is connected to an ac mains supply of 220 V to operate at 11000 V, 88 watt. The current in the secondary circuit, ignoring the power loss in the transformer, is

A uniform wire of diameter \(d\) carries a current of \(100 \, \text{mA}\) when the mean drift velocity of electrons in the wire is \(v\). For a wire of diameter \(\frac{d}{2}\) of the same material to carry a current of \(200 \, \text{mA}\), the mean drift velocity of electrons in the wire is

In an electrical circuit, the voltage is measured as V = (200 ± 4) volt and the current is measured as I = (20 ± 0.2) A. The value of the resistance is:

A 12 pF capacitor is connected to a 50 V battery, the electrostatic energy stored in the capacitor in nJ is

In the circuit shown below, the inductance \(L\) is connected to an AC source. The current flowing in the circuit is:
\(I = I_0 \sin \omega t\).
The voltage drop (\(V_L\)) across \(L\) is:

An ideal fluid is flowing in a non-uniform cross-sectional tube XY (as shown in the figure) from end X to end Y. If $K_1$ and $K_2$ are the kinetic energy per unit volume of the fluid at X and Y respectively, then the correct option is :

An object falls from a height of 10 m above the ground. After striking the ground it loses $50\%$ of its kinetic energy. The height upto which the object can rebounce from the ground is:

An object moving along horizontal x-direction with kinetic energy \(10 \, \text{J}\) is displaced through \(\mathbf{x} = (3\mathbf{i}) \, \text{m}\) by the force \(\mathbf{F} = (-2\mathbf{i} + 3\mathbf{j}) \, \text{N}\). The kinetic energy of the object at the end of the displacement \(\mathbf{x}\) is: