List of practice Questions

In which of the following viscous force does not depend ?

Dimensions of planck's constant is equal to that of

Positive rays made of

$X$-rays was discovered by

Control rods used in nuclear reactors are made of

The star appears blue, when its surface temperature is

A particle is projected from the ground with an initial speed of v at an angle $\theta$ with horizontal. The average velocity of the particle between its point of projection and highest point of trajectory is

A car is travelling with a linear velocity $v$ on a circular road of radius $r$. If it is increasing its speed at the rate of $a m / s ^{2}$, then the resultant acceleration will be

A prism is made up of material of refractive index $\sqrt{3}$. The angle of prism is $A$. If the angle of minimum deviation is equal to the angle of the prism, then the value of $A$ is

The half-life of a radioactive substance is $10$ days. This means that

A source and an observer are moving towards each other with a speed equal to $v/2$, where $v$ is the speed of sound. The source is emitting sound of frequency $n$. The frequency heard by one observer will be

1 curie is

To double the covering range of a TV transmitter tower, its height should be made

An alternating voltage V = $V_0 \sin \omega t$ is applied across a circuit. As result $I = I_0 \sin(\omega t - \pi /2)$ flows in it. The power consumed per cycle is

A boy of mass $m$ stands on one end of a wooden planck of length $L$ and mass $M$. The plank is floating on water. If the boy walks from one end of the plank to the other end at a constant speed, the resulting displacement of the plank is given by

Sound waves do not show the phenomenon of

The magnifying power of a compound microscope is high if

: $p$-chlorobenzoic acid is stronger acid than benzoic acid. : Chlorine has electron donating resonance $(+ R )$ effect.

Tasar silkworm feeds on the leaves of