List of top Physics Questions

In the following, the one which is not a physical quantity is

A system is shown in the figure. A man standing on the block is pulling the rope. The velocity of the point of string in contact with the hand of the man is 2 m/s downwards. The velocity of the block will be [assume that the block does not rotate]

The current drawn by the primary of a transformer, which steps down $200\,V$ to $20\,V$ to operate a device of resistance $20\,\Omega $. is (Assume the efficiency of the transformer to be $80\, \%$)

A body sliding on a frictionless track which terminates in a straight horizontal section CD. The body starts slipping from A and reaches point D. If h1 = 1 m, then how far from point D, will the body hit the ground?Take, g = 10 ms^-2.

One end of a cylindrical glass rod ($\mu$ = 1.5) is given the shape of a concave refracting surface of radius 10 cm. An air bubble is situated in the glass rod at.a .point on its axis such that it appears to be at distance 10 cm from the surface and inside glass when seen from the other medium. The actual location of air bubble is

Two particles $ A $ and $ B $ are projected with same speed so that the ratio of their maximum heights reached is $ 3:1 $ . If the speed of $ A $ is doubled without altering other parameters, the ratio of the horizontal ranges attained by $ A $ and $ B $ is

i and j are unit vectors along x- and y- axis respectively. What is the magnitude and direction of the vectors i+j and i-j ? What are the components of a vector A= 2 i + 3 j along the directions of i + j + and i - j ? [You may use graphical method]

An electric charge $10^{-3} \mu C$ is placed at the origin $(0,0)$ of $X-Y$ coordinate system. Two points $A$ and $B$ are situated at $(\sqrt{2}, \sqrt{2})$ and $(2,0)$ respectively. The potential difference between the points $A$ and $B$ will be

In the formula,

X = 3 Y Z^{2}, X

and

Z

have dimensions of capacitance and magnetic field respectively. What are the dimensions of

Y

in the MKSQ system?

A wave in a string has amplitude of 2 cm. The wave travels in the +ve direction of x axis with a speed of

128 {m s}^{- 1}

and it is noted that 5 complete waves fit in 4 m length of the string. The equation describing the wave is:

In an electromagnetic wave, the magnitude of electric and magnetic fields are 100 V/m and 0.265 A/m. The maximum energy flow is

What should be the length of a half-wave dipole antenna for a carrier wave having frequency

3 \times 10^{8}

Hz?

An equilateral triangle ABC formed from a uniform wire has two small identical beads initially located at A. The triangle is set rotating about the vertical axis AO. Then the beads are released from rest simultaneously and allowed to slide down, one along AB and other along AC as shown. Neglecting frictional effects, the quantities that are conserved as the beads slide down are:

Find the amount of work done in rotating a dipole of dipole moment

3 \times 10^{- 3} c m

from its position of stable equilibrium to the position of unstable equilibrium, in a uniform electric field of intensity

10^{4} {N C}^{- 1}

.

The dielectric constant of an insulator cannot be :

If the radius of earth shrinks by 0.2% without change in its mass, the % change in its angular velocity is

Two forces in the ratio 1 : 2 act simultaneously on a particle. The resultant of these forces is three times the first force. The angle between them is

A galvanometer has a resistance of 96 Ω and it is desired to pass 4% of the total current through it. The value of shunt resistance is ____?

A body of mass m strikes another body at rest of mass $ \frac{m}{9} $ . Assuming the impact to be inelastic the fraction of the initial kinetic energy transformed into heat during the contact is

A man (mass = 50 kg) is in an elevator with is moving with acceleration 0.49 m/s2 upwards. Find normal reaction exerted by man on floor of the elevator

The earth revolves around the sun in one year. If distance between them becomes double, the new time period of revolution will be

A closely wound solenoid of $2000 $ turns and area of cross-section $1.6 × 10^{-4}\ m^2$, carrying a current of $4.0 \ A$, is suspended through its centre allowing it to turn in a horizontal plane.
(a) What is the magnetic moment associated with the solenoid?
(b) What is the force and torque on the solenoid if a uniform horizontal magnetic field of $7.5 × 10^{-2}\ T$ is set up at an angle of $30º$ with the axis of the solenoid?

Velocity of sound in vacuum is

A ball initially at rest, breaks into two masses m1 and m2 that move with speed 11 and v2 respectively as shown. The ratio of the kinetic energy of the right mass to the left mass is:

Which of the following is incorrect for paramagnetic materials?