List of top Physics Questions asked in IIT JAM BT

A box of mass 20 π‘˜π‘” is pulled at constant speed across a floor by a rope. The rope makes an angle of 45Β° with the horizontal. Assuming that friction is negligible, the work done in pulling the box by a distance of 20 π‘š is _____ 𝐽 (rounded off to the nearest integer). (Use $𝑔 = 9.8 π‘šπ‘ ^{βˆ’2}$)
A ball dropped from a bridge hits the surface of the water in 3 𝑠. The height of the bridge, ignoring air resistance, is ___ π‘š (rounded off to one decimal place). (Use $𝑔 = 9.8 π‘šπ‘ ^{βˆ’2}$)
The wavelength of visible light for the green color is 600 π‘›π‘š. The energy of photons of this color is _______ 𝑒𝑉 (rounded off to one decimal place). (Planck’s constant = $6.63 Γ— 10^{βˆ’34} 𝐽𝑠, 1 𝑒𝑉 = 1.6 Γ— 10^{βˆ’19} 𝐽$, speed of light = $3 Γ— 10^8 π‘šπ‘ ^{βˆ’1}$)
An object is placed 15 π‘π‘š in front of a convex mirror, which has a radius of curvature 30 π‘π‘š. Which one of the following is true of the image formed?
Two resistors 2 Ξ© and 4 Ξ© are combined in parallel. If this combination is connected to a battery of 16 𝑉, the maximum current that can be drawn from the battery is ________ 𝐴 (rounded off to the nearest integer).
Rain is falling vertically with a speed of 40 $m s^{-1}$. Wind starts blowing with a speed of 16 $m s^{-1}$ in the west to east direction. How should a person, who is standing, hold his umbrella to avoid getting wet?
A massless ideal spring is hanging vertically. A sphere of mass of 500 g, suspended from the spring, stretches the spring from its initial position by 50 cm when it reaches equilibrium. The force constant of the spring is _________ $N m^{-1}$. ($Use g=10 m s^{-2}$)
Whales can dive undersea to depths of 2 km. The pressure on the whale at this depth (ignoring atmospheric pressure) is _____ $Γ— 10^6 Pa$. (Density of sea water = $1 g cm^{-3}$ and $g =10 m s^{-2}$)
The heat required to convert 2 kg of water at 20 Β°C in a calorimeter to steam at 100 Β°C and at atmospheric pressure (1 atm) is _____ kJ. (Specific heat capacity of water is $4.2 kJ kg^{-1} K^{-1}$ and latent heat of steam is $2256 kJ kg^{-1}$)
An electron is accelerated from rest through a potential difference of 200 V. The de Broglie wavelength associated with this electron is _____ nm. (Rounded off to 2 decimal places) (Planck’s constant = $6.6 Γ— 10^{-34} J s, 1eV=1.6 Γ— 10^{-19} J$, mass of an electron = $9.1Γ—10^{-31} kg$)
An object is placed at the principal focus of a concave lens of focal length 10 cm. The image will be formed at___ cm, between the optical center and the focus of the lens on the same side of the object.
What is the maximum number of hydrogen bonds that a water molecule can make in the liquid state?
Calculate the temperature (in K) at which the resistance of a metal becomes 20% more than its resistance at 300 K. The value of the temperature coefficient of resistance for this metal is \(2.0 \times  10^{-4}\)/K.
A man throws a ball vertically up in the air with an initial velocity v1 such that it reaches a height of 12 m with a speed of 12 m/s. If he throws the same ball vertically up with an initial velocity v such that it reaches a maximum height of 12 m. Calculate v1/v2 (up to 2 decimal places).
What is the acceleration due to gravity (m/sΒ²) on the surface of a planet if its radius is 1/4th that of earth and its mass is 1/80th that of earth" Assume that the gravity on the surface of the earth is 10 m/sΒ².
The potential difference to accelerate an electron was quadrupled. By what factor does the de Broglie wavelength of the electron beam change?
A 500 nm light is used for imaging in a confocal microscope. What will be the best resolution (in nm) of this microscope?
One point charge (q) each, is placed along a line at 3 different points \(x = 0\), \(x = 2 \, \text{nm}\) and \(x = 6 \, \text{nm}\). The force between two charges separated by 2 nm is 2 piconewton (pN). The magnitude of force (in pN) on the charge in the middle due to the other two charges is ..............
Consider two bodies with equal masses of \( 10^{12} \) kg each and R distance apart. Let G be the gravitational constant and \( V_0 \) be a constant with dimensions of energy. Which of the following represent(s) gravitational potential energy (V) between the bodies, such that Newton's law of gravitation is valid?
Which of the following is(are) CORRECT?
Consider monoatomic ideal gas molecules of equal mass \( m \) in thermal equilibrium, at temperature \( T \). Which one of the following equations is correct? (the angular brackets denote average, \( k_B \) is Boltzmann constant, \( v \) is velocity, and \( v_x \) is the x-component of velocity)
At a given time \( t \), velocity \( v(t) \) and acceleration \( a(t) \) of a particle undergoing simple harmonic motion are given by
\[ v(t) = -100 \sin \left( 20 t + \frac{\pi}{3} \right), \] \[ a(t) = -2000 \cos \left( 20 t + \frac{\pi}{3} \right). \] Assuming all quantities are in SI units, the amplitude of the oscillation is ............
Consider two particles, each of mass 20 g; the first particle is moving with a speed of 10 m/s along a one-dimensional track in the positive x-direction and collides with the second particle at rest. Assuming that the collision is elastic, the speed (in m/s) of the first particle after the collision is ...............
A compound microscope has its objective with linear magnification of 10. In order to achieve a final magnification of 100, the angular magnification of the eyepiece should be ..........
Consider a spherical particle of mass \( m \) and radius \( r \) moving in a medium. Its velocity at any time is given by \( v = v_0 \exp\left( -\frac{6 \pi X r t}{m} \right) \), where \( v_0 \) is the initial velocity of the particle. The dimensions of \( X \) are