List of top Physics Questions

Three bricks each of length $L$ and mass $M$ are arranged as shown from the wall. The distance of the centre of mass of the system from the wall is

The moment of inertia of a thin uniform rod of mass M and length L about an axis passing through its midpoint and perpendicular to its length is $I_0$. Its moment of inertia about an axis passing through one of its ends and perpendicular to its length is

A projectile has

Feeling of weightlessness in a satellite or spaceship is due to

Two lead balls of masses m and 5m having radii R and 2R are separated by 12R, If they attract.each other by gravitational force, the distance covered by small sphere before they touch each other is

A 3.0 cm wire carrying a current of 10 A is placed inside a solenoid perpendicular to its axis. The magnetic field inside the solenoid is given to be 0.27 T. What is the magnetic force on the wire?

Equal volumes of monoatomic and diatomic gases at the same temperature are given equal quantities of heat. Then

The displacement of a body is given to be proportional to the cube of time elapsed. The magnitude of the acceleration of the body, is

A conducting loop is placed in a uniform magnetic field with its plane perpendicular to the field. An emf is induced in the loop if

A beam of light consisting of two wavelengths, 650 nm and 520 nm, is used to obtain interference fringes in a Young’s double-slit experiment.
(a) Find the distance of the third bright fringe on the screen from the central maximum for wavelength 650 nm.
(b) What is the least distance from the central maximum where the bright fringes due to both the wavelengths coincide?

In a Young’s double-slit experiment, the slits are separated by 0.28 mm and the screen is placed 1.4 m away. The distance between the central bright fringe and the fourth bright fringe is measured to be 1.2 cm. Determine the wavelength of light used in the experiment.

𝑆₁ and 𝑆₂ are two identical sound sources of frequency 656 Hz. The source 𝑆₁ is located at 𝑂 and 𝑆₂ moves anti-clockwise with a uniform speed of 4$\sqrt{2}$ ms^-1 on a circular path around 𝑂, as shown in the figure. There are three points 𝑃, 𝑄 and 𝑅 on this path such that 𝑃 and 𝑅 are diametrically opposite while 𝑄 is equidistant from them. A sound detector is placed at point 𝑃. The source 𝑆₁ can move along the direction 𝑂𝑃. [Given: The speed of sound in air is 324 ms^-1]. When only 𝑆₂ is emitting sound and it is at 𝑄, the frequency of sound measured by the detector in Hz is _________

Which of the following is NOT the reason for calling steel more elastic than rubber ?

The momentum of an electron revolving in $n ^{\text {th }}$ orbit is given by : (Symbols have their usual meanings)

If X times momentum is work, then the dimensiona! formula of X Is

A car is moving with a uniform speed of

72 k m / h

. After applying brakes it stops after traveling

100 m

distance. If its mass along with the passengers is

1000 k g

, then the value of force due to the application of brakes will be in newton:

The photoelectric cut-off voltage in a certain experiment is 1.5 V. What is the maximum kinetic energy of photoelectrons emitted?

The work function of caesium metal is $2.14 eV$. When light of frequency $6×1014Hz$ is incident on the metal surface,photoemission of electrons occurs. What is the
(a)maximum kinetic energy of the emitted electrons,
(b)Stopping potential, and
(c)maximum speed of the emitted photoelectrons?

Four point charges $q_A$$ = 2 µC$, $q_B$ $= −5 µC$, $q_C$ = 2 µC, and $q_D$ $= −5 µC$ are located at the corners of a square ABCD of side 10 cm. What is the force on a charge of 1 µC placed at the centre of the square?

The displacement equation of a spring block system is given by $y=a\,\sin\,\omega t$ in air. It is completely immersed in water if $A^|\,and\,\omega^|$ be new amplitude and angular frequency then

If a ladder weighing $250\, N$ is placed against a smooth vertical wall having coefficient of friction between it and floor is $ 0.3 $, then what is the maximum force of friction available at the point of contact between the ladder and the floor?

A bucket of water contain a wooden block floating in water with(4/5)th of its volume sub merged in the water. The bucket is placed on the floor of a lift and the lift now starts moving down with uniform accleration. The block of wood now

Figure 9.37 shows an equiconvex lens (of refractive index 1.50) in contact with a liquid layer on top of a plane mirror. A small needle with its tip on the principal axis is moved along the axis until its inverted image is found at the position of the needle.

an equiconvex lens in contact with a liquid layer on top of a plane mirror

Three particles A B & C start from the origin at the same time; A with U velocity 'a' along x - axis, B with a velocity 'b' along y-axis and C with velocity 'c' in XY plane along the line x = y. The magnitude of 'c' so that the three always remain collinear is :

Time constant of LC circuit is