List of top Physics Questions asked in JEE Main

Three blocks A, B and C are pulled on a horizontal smooth surface by a force of 80 N as shown in figure

The tensions T1 and T2 in the string are respectively:

Wheatstone bridge principle is used to measure the specific resistance $ (S_1) $ of a given wire, having length $ L $, radius $ r $. If $ X $ is the resistance of the wire, then specific resistance is: $$ S_1 = X\left( \frac{\pi r^2}{L} \right). $$ If the length of the wire gets doubled, then the value of specific resistance will be:

Given below are two statements:
Statement (I): Viscosity of gases is greater than that of liquids.
Statement (II): Surface tension of a liquid decreases due to the presence of insoluble impurities.
In the light of the above statements, choose the most appropriate answer from the options given below:

In a vernier calliper, when both jaws touch each other, zero of the vernier scale shifts towards left and its $4^\text{th}$ division coincides exactly with a certain division on the main scale. If 50 vernier scale divisions equal to 49 main scale divisions and zero error in the instrument is 0.04 mm, then how many main scale divisions are there in 1 cm?

A square loop PQRS having 10 turns, area $3.6 \times 10^{-3} \, \text{m}^2$, and resistance $100 \, \Omega$ is slowly and uniformly being pulled out of a uniform magnetic field of magnitude $B = 0.5 \, \text{T}$ as shown. Work done in pulling the loop out of the field in $1.0 \, \text{s}$ is ______ $ \times 10^{-6} \, \text{J} $.

A point source is emitting sound waves of intensity $ 16 \times 10^{-8} \, Wm^{-2} $ at the origin. The difference in intensity (magnitude only) at two points located at distances of 2 m and 4 m from the origin respectively will be _____ $ \times 10^{-8} \, Wm^{-2} $.

A circular table is rotating with an angular velocity of $ \omega \, \text{rad/s} $ about its axis (see figure). There is a smooth groove along a radial direction on the table. A steel ball is gently placed at a distance of $ 1 \, \text{m} $ on the groove. All the surfaces are smooth. If the radius of the table is $ 3 \, \text{m} $, the radial velocity of the ball with respect to the table at the time the ball leaves the table is $ x\sqrt{2}\omega \, \text{m/s} $, where the value of $ x $ is $\dots$.

A clock has a 75 cm long second hand and a 60 cm long minute hand, respectively. In 30 minutes duration, the tip of the second hand will travel $x$ distance more than the tip of the minute hand. The value of $x$ in meters is nearly (Take $\pi = 3.14$):

Ratio of radius of gyration of a hollow sphere to that of a solid cylinder of equal mass, for moment of Inertia about their diameter axis AB as shown in figure is $\sqrt\frac{8} {x }$. The value of x is:

A heavy iron bar of weight 12 kg is having its one end on the ground and the other on the shoulder of a man. The rod makes an angle $60^\circ$ with the horizontal, the weight experienced by the man is :

When unpolarized light is incident at an angle of 60° on a transparent medium from air. The reflected ray is completely polarized. The angle of refraction in the medium is

A stone of mass 900 g is tied to a string and moved in a vertical circle of radius 1 m making 10 rpm. The tension in the string, when the stone is at the lowest point, is (if $ \pi^2 = 9.8 $ and $ g = 9.8 \, \text{m/s}^2 $)

Match List-I with List-II

Choose the correct answer from the options given below :

The following figure represents two biconvex lenses $ L_1 $ and $ L_2 $ having focal lengths 10 cm and 15 cm, respectively. The distance between $ L_1 $ and $ L_2 $ is:

A body of mass 50 kg is lifted to a height of 20 m from the ground in the two different ways as shown in the figures. The ratio of work done against the gravity in both the respective cases, will be:

A given object takes $n$ times the time to slide down $45^\circ$ rough inclined plane as it takes the time to slide down an identical perfectly smooth $45^\circ$ inclined plane. The coefficient of kinetic friction between the object and the surface of inclined plane is:

A satellite of $ 10^3 \, \text{kg} $ mass is revolving in a circular orbit of radius $ 2R $. If \[ \frac{10^4 R}{6} \, \text{J} \] energy is supplied to the satellite, it would revolve in a new circular orbit of radius: \[ \text{(use } g = 10 \, \text{m/s}^2, \, R = \text{radius of earth)}. \]

A bus moving along a straight highway with speed of 72 km/h is brought to halt within 4s after applying the brakes. The distance travelled by the bus during this time (Assume the retardation is uniform) is _______m.

A body of mass $2 \, \text{kg}$ begins to move under the action of a time-dependent force given by $\vec{F} = (6t \, \hat{i} + 6t^2 \, \hat{j}) \, \text{N}$. The power developed by the force at the time $t$ is given by:

A 1 kg mass is suspended from the ceiling by a rope of length 4m. A horizontal force 'F' is applied at the mid point of the rope so that the rope makes an angle of 45° with respect to the vertical axis as shown in figure. The magnitude of F is

A straight magnetic strip has a magnetic moment of $ 44 \, \text{A m}^2 $. If the strip is bent in a semicircular shape, its magnetic moment will be $ \dots $ A m$^2$. \[ \text{(Given } \pi = \frac{22}{7} \text{)} \]

Consider a block and trolley system as shown in figure. If the coefficient of kinetic friction between the trolley and the surface is 0.04, the acceleration of the system in m/s² is : (Consider that the string is massless and unstretchable and the pulley is also massless and frictionless) :

A ceiling fan having 3 blades of length 80 cm each is rotating with an angular velocity of 1200 rpm. The magnetic field of earth in that region is 0.5 G and the angle of dip is $ 30^\circ $. The emf induced across the blades is $ N \pi \times 10^{-5} \, \text{V} $. The value of $ N $ is $ \_\_\_\_\_ $.

If $\vec{a}$ and $\vec{b}$ make an angle $\cos^{-1}\left(\frac{5}{9}\right)$ with each other, then \[ |\vec{a} + \vec{b}| = \sqrt{2} |\vec{a} - \vec{b}| \quad \text{for } |\vec{a}| = n |\vec{b}|. \] The integer value of $n$ is _____.

A force $ (3x^2 + 2x - 5) \, \text{N} $ displaces a body from $ x = 2 \, \text{m} $ to $ x = 4 \, \text{m} $. The work done by this force is _________ J.