List of practice Questions

Light can be polarized by

The time period of a simple pendulum is to be doubled. Its length should be

A concave lens and a convex lens have same focal length of $20$ cm and both put in contact with combination is used to view an object $5$ cm long kept at $20$ cm from the lens combination. As compared to object the image will be.

Longitudinal waves cannot show the phenomenon of

If two soap bubbles of different radii are connected by a tube,

One mole of ideal monoatomic gas $(\gamma = 5/3)$ is mixed with one mole of diatomic gas $(\gamma = 7/5)$. What is $\gamma$ for the mixture? $\gamma$ Denotes the ratio of specific heat at constant pressure, to that at constant volume.

Two masses $m_1 = 5$ kg and $m_2 = 4.8$ kg tied to a string are hanging over a light frictionless pulley. What is the acceleration of the masses when lift free to move? $(g = 9.8 m/s^2)$

A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the particle, the motion of the particle takes place in a plane. It follows that

Spherical balls of radius $'R'$ are falling in a viscous fluid of viscosity '$\eta$' with a velocity '$v$'. The retarding viscous force acting on the spherical ball is

A body of mass m, accelerates uniformly from rest to $v_1$ in time $t_1$. The instantaneous power delivered to the body as a function of time t is

At the time of total solar eclipse, the spectrum of solar radiation will have

For formation of permanent magnets, the material should have:

Eddy currents are produced in:

What are the units of $K = 1/4 \pi \varepsilon_{0}? $

Which scientist experimentally proved the existance of electromagnetic waves?

A boat of mass $40\, kg$ is at rest. A dog of mass $4 \,kg$ moves in the boat with a velocity of $10\, m/s$. What is the velocity of boat?

$v_{rms}, v_{av} $ and $v_{mp}$ are root mean square, average and most probable speeds of molecules of a gas obeying Maxwellian velocity distribution. Which of the following statements is correct?

Drift velocity varies with the velocity of electric field as per the relation

Science which links heredity with environment is

Greatest biological problem which man faces today is

Conifers are found in

Lateral meristem is responsible for

At the time of total solar eclipse, the spectrum of solar radiation will have :

The effective acceleration of a body, when thrown upwards with acceleration $ a $ will be:

just as hydrochloric acid is to pepsinogen, so is