List of top Physics Questions asked in JEE Main

The ratio of magnetic field due to coil at centre and at distance of R from the centre on the axis passing through the centre and perpendicular to the plane of ring is : 1x (R is the radius of coil), find the value of x.
A steel rod of length 1 m and cross sectional area 10-4 m² is heated from 0°C to 200°C without being allowed to extend or bend. The compressive tension produced in the rod is______ ×104N. (Given Young's modulus of steel = 2×1011 Nm-2, coefficient of linear expansion = 10-5K-1)
A hollow spherical ball of uniform density rolls up a curved surface with an initial velocity 3 m/s (as shown in figure). Maximum height with respect to the initial position covered by it will be_____ cm (take, g = 10 m/s²)
A hollow spherical ball of uniform density
The number density of free electrons in copper is nearly 8 × 1028 m-3. A copper wire has its area of cross section = 2 × 10-6 m² and is carrying a current of 3.2 A. The drift speed of the electrons is _____ ×10-6 ms-1
A series combination of resistor of resistance 100 Ω, inductor of inductance 1 H and capacitor of capacitance 6.25 µF is connected to an ac source. The quality factor of the circuit will be ______

A body of mass \( (5 \pm 0.5) \, \text{kg} \) is moving with a velocity of \( (20 \pm 0.4) \, \text{m/s} \). Its kinetic energy will be:

A 600 pF capacitor is charged by 200 V supply. It is then disconnected from the supply and is connected to another uncharged 600 pF capacitor. Electrostatic energy lost in the process is _____ μ.J
In photo electric effect
A. The photocurrent is proportional to the intensity of the incident radiation.
B. Maximum Kinetic energy with which photoelectrons are emitted depends on the intensity of incident light.
C. Max. K.E with which photoelectrons are emitted depends on the frequency of incident light.
D. The emission of photoelectrons require a minimum threshold intensity of incident radiation.
E. Max. K.E of the photoelectrons is independent of the frequency of the incident light.
Choose the correct answer from the options given below:

The equivalent resistance between \( A \) and \( B \) as shown in the figure is:
The equivalent resistance between

An engine operating between the boiling and freezing points of water will have 
A. efficiency more than 27%  
B. efficiency less than the efficiency a Carnot engine operating between the same two temperatures.  
C. efficiency equal to 27%  
D. efficiency less than 27% 

A radio active material is reduced to 1/8 of its original amount in 3 days.
If 8×10-3 kg of the material is left after 5 days the initial amount of the material is
For particle P revolving round the centre O with radius of circular path r and angular velocity ω, as shown in below figure, the projection of OP on the x-axis at time t is
For particle P revolving round the centre O
If a planet has mass equal to 16 times the mass of earth, and radius equal to 4 times that of earth. The ratio of escape speed of a planet to that of earth is?
For a given transistor amplifier circuit in CE configuration VCC = 1 V, Rc = 1 kΩ, Rb = 100 kΩ and β = 100. Value of base current Ib is
For a given transistor amplifier circuit in CE
A bullet of mass 0.1 kg moving horizontally with speed 400 ms-1 hits a wooden block of mass 3.9 kg kept on a horizontal rough surface. The bullet gets embedded into the block and moves 20m before coming to rest. The coefficient of friction between the block and the surface is ______.
(Given g = 10 m/s²)
The trajectory of projectile, projected from the ground is given by y=x-x2/20. Where x and y are measured in meter. The maximum height attained by the projectile will be
Given below are two statements :  
Statement I : When the frequency of an a.c. source in a series LCR circuit increases, the current in the circuit first increases, attains a maximum value and then decreases.  
Statement II : In a series LCR circuit, the value of power factor at resonance is one. 
In the light of given statements, choose the most appropriate answer from the options given below:
Statement —I: Electromagnets are made of soft iron. 
Statement —II: Soft iron has lower permeability and high retentivity. 
Choose the correct option related to statements.
The temperature at which the kinetic energy of oxygen molecules becomes double than its value at 27°C is
The width of fringe is 2 mm on the screen in a double slits experiment for the light of wavelength of 400 nm. The width of the fringe for the light of wavelength 600 nm will be:
The amplitude of 15sin(1000πt) is modulated by 10sin(4πt) signal. The amplitude modulated signal contains frequency(ies) of
(A) 500 Hz 
(B) 2 Hz  
(C) 250 Hz  
(D) 498 Hz  
(E) 502 Hz 
Choose the correct answer from the options given below: 
A Carnot engine working between 27°C and 127°C performs 2 kJ of work. The amount of heat rejected is equal to:
Given below are two statements:
Statement I: A truck and a car moving with same kinetic energy are brought to rest by applying brakes which provide equal retarding forces. Both come to rest in equal distance. 
Statement II : A car moving towards east takes a turn and moves towards north, the speed remains unchanged. The acceleration of the car is zero. 
In the light of given statements, choose the most appropriate answer from the options given below.  
An emf of 0.08 V is induced in a metal rod of length 10 cm held normal to a uniform magnetic field of 0.4 T, when moves with a velocity of:
Which of the following expressions give the value of acceleration due to gravity (g') at the altitude h above the surface of Earth.
(R = radius of Earth, g = acceleration due to gravity at surface of Earth)