List of top Physics Questions asked in JEE Main

In an experiment of determine the Young’s modulus of wire of a length exactly 1 m, the extension in the length of the wire is measured as 0.4 mm with an uncertainty of ±0.02 mm when a load of 1 kg is applied. The diameter of the wire is measured as 0.4 mm with an uncertainty of ±0.02 mm when a load of 1 kg is applied. The diameter of the wire is measured as 0.4 mm with an uncertainty of ± 0.01 mm. The error in the measurement of Young’s modulus (ΔY) is found to be x × 1010 Nm–2. The value of x is ___.
(Take g=10 m/s2)
The velocity of sound in a gas, in which two wavelengths, 4.08 m and 4.16 m produce 40 beats in 12 s, will be:
If the initial velocity in horizontal direction of a projectile is unit vector \(\hat i\) and the equation of trajectory is \(y = 5x(1 – x)\). The y component vector of the initial velocity is ______ \(\hat j\).
(Take \(g=10\ m/s^2\))

Motion of a particle in x–y plane is described by a set of following
\(x = 4sin (\frac{π}{2} - ωt )m\)
and y = 4sin(ωt) m. The path of the particle will be

In the following circuit, the correct relation between output (Y) and inputs A and B will be:
 

Fig. Circuit
For using a multimeter to identify diode from electrical components, choose the correct statement out of the following about the diode:

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.

Assertion A :n-p-n transistor permits more current than a p-n-p transistor.
Reason R: Electrons have greater mobility as a charge carrier.

Choose the correct answer from the options given below:

A disc of mass 1 kg and radius R is free to rotate about a horizontal axis passing through its centre and perpendicular to the plane of disc. A body of same mass as that of disc of fixed at the highest point of the disc. Now the system is released, when the body comes to the lowest position, it angular speed will be \(4\sqrt {\frac {x}{3R}}\) rad s−1 where x = ______ .(g = 10 ms–2)

Given below are two statements
Statement-I: When μ amount of an ideal gas undergoes adiabatic change from state (P1, V1, T1) to state (P2, V2, T2), then work done is
\(W = \frac{μR(T2 - T1)}{1 - γ}\)
,where
\(γ = \frac{Cp}{Cv} \)and R = universal gas constant. 
Statement-II: In the above case, when work is done on the gas, the temperature of the gas would rise.
Choose the correct answer from the options given below.

Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R.

Assertion A : Product of Pressure (P) and time (t) has the same dimension as that of coefficient of viscosity.
Reason R : Coefficient of viscosity
\(= \frac{Force}{Velocity ∼ gradient}\)

Choose the correct answer from the options given below.

The Q-value of a nuclear reaction and kinetic energy of the projectile particle, Kp are related as :
A water drop of diameter 2 cm is broken into 64 equal droplets. The surface tension of water is 0.075 N/m. In this process the gain in surface energy will be
The de Broglie wavelengths for an electron and a photon are λe and λp, respectively. For the same kinetic energy of electron and photon, which of the following presents the correct relation between the de Broglie wavelengths of two?

Match List-I with List-II.

                    List - IList - II
A.Television signal i.03 KHz 
B.Radio signalii.20 KHz
C.High Quality Musiciii.02 MHz
D.Human speechiv.06 MHz 

Choose the correct answer from the options given below:

 

Two planets A and B of equal mass are having their period of revolutions TA andTB such that TA= 2TB. These planets are revolving in the circular orbits of radii rA and rB respectively. Which out of the following would be the correct relationship of their orbits?
Given below are two statements
Statement-I: A point charge is brought in an electric field. The value of electric field at a point near to the charge may increase if the charge is positive.
Statement-II: An electric dipole is placed in a non-uniform electric field. The net electric force on the dipole will not be zero.
Choose the correct answer from the options given below.
When a car is approaching the observer, the frequency of horn is 100 Hz. After passing the observer, it is 50 Hz. If the observer moves with the car, the frequency will be \(\frac x3\) Hz, where x = _____ .

The three charges q/2, q and q/2 are placed at the corners A, B and C of a square of side ‘a’ as shown in figure. The magnitude of electric field (E) at the corner D of the square is
 

Fig.
A radar sends an electromagnetic signal of electric field (E0) = 2.25 V/m and magnetic field (B0) = 1.5 × 10–8 T which strikes a target on line of sight at a distance of 3 km in a medium. After that, a part of signal (echo) reflects back towards the radar with same velocity and by same path. If the signal was transmitted at time t = 0 from radar, then after how much time echo will reach to the radar?
An infinitely long hollow conducting cylinder with radius R carries a uniform current along its surface.
Choose the correct representation of magnetic field (B) as a function of radial distance (r) from the axis of cylinder.

Match List-I with List-II.

 List - I List - II
  A.    Moment of inertia of solid sphere of Radius R about any tangent           i.\(\frac{5}{3}MR^2\)  
B.Moment of inertia of hollow sphere of radius (R) about any tangentii.\(\frac{7}{5}MR^2\)
C.Moment of inertia of circular ring of radius (R) about its diameteriii.\(\frac{1}{4}MR^2\)
D.Moment of inertia of circular disc of radius (R) about any diameteriv.\(\frac{1}{2}MR^2\)

Choose the correct answer from the options given below.

 

 

 

 



 

A particle of mass m is moving in a circular path of constant radius r such that its centripetal acceleration (a) is varying with time t as a = k2rt2, where k is a constant. The power delivered to the particle by the force acting on it is given as
A singly ionized magnesium atom (A=24) ion is accelerated to kinetic energy 5keV and is projected perpendicularly into a magnetic field B of the magnitude 0.5 T. The radius of path formed will be ________ cm.

A meter bridge setup is shown in the figure. It is used to determine an unknown resistance R using a given resistor of 15 Ω. The galvanometer (G) shows null deflection when tapping key is at 43 cm mark from end A. If the end correction for end A is 2 cm, then the determined value of R will be ___ Ω.

Fig. Meter Bridge

Current measured by the ammeter Ⓐ in the reported circuit when no current flows through 10 Ω resistance, will be ___ A.

Fig. Circuit