In semiconductors at room temperature,

A particle at rest starts moving with a constant angular acceleration of $4 \mathrm{~rad} / \mathrm{s}^2$ in a circular

The logic circuit in figure is equivalent to

The intensity of light coming from one of the slits in Young's double slit experiment is double the intensity from the o

A sample of oxygen gas and a sample of hydrogen gas both have the same mass, same volume and the same pressure. The rati

The height above the earth's surface at which the acceleration due to gravity becomes $\left(\frac{1}{n}\right)$ times t

A streamline flow of a liquid of density ' $\rho$ ' is passing through a horizontal pipe of crosssectional area $A_1$ an

In an a.c. circuit $\mathrm{I}=100 \sin 200 \pi \mathrm{t}$. The time required for the current to achieve its peak value

90 J of work is done to move an electric charge of magnitude 3 C from a place A , where potential is -10 V to another pl

A particle is performing simple harmonic motion and if the oscillations are Camped oscillations then the angular frequen

The magnetic energy stored in an inductor of inductance $5 \mu \mathrm{H}$ carrying a current of 2 A is

Two identical blocks each of mass ' M ' attached to the ends of a massless inextensible string which passes over a pulle

The radius of innermost orbit of hydrogen atom is $5.3 \times 10^{-11} \mathrm{~m}$. The radius of fourth allowed orbit

Two thin lenses have a combined power of +9D. When they are separated by a distance of 20 cm , their equivalent power be

Two simple harmonic progressive waves have displacements $\rightarrow \mathrm{y}_1=\mathrm{a}_1 \sin \left(\frac{2 \pi \

The pressure inside a soap bubble A is 1.01 atmosphere and that in a soap bubble B is 1.02 atmosphere. The ratio of volu

A bicycle wheel of radius ' $R$ ' has ' $n$ ' spokes. It is rotating at the rate of ' $F$ ' r.p.m. perpendicular to the

Choose the correct answer. When a point of suspension of pendulum is moved vertically upward with acceleration ' $a$ ',

When a metallic surface is illuminated with a radiation of wavelength ' $\lambda$ ', the stopping potential is ' $V$ '.

The magnetic field at the centre of a current carrying circular coil of area ' $A$ ' is ' $B$ '. The magnetic moment of

The P-V graph of an ideal gas, cycle is shown. The adiabatic process is described by the region

A galvanometer of resistance ' $G$ ' is shunted by resistance of 'S' ohm. To keep the main current in the circuit unchan

In an A.C. circuit, the potential difference ' $V$ ' and current 'I' are given respectively by $\mathrm{V}=100 \sin (100

An annular ring has mass 10 kg and inner and outer radii are 10 m and 5 m respectively. Its moment of inertia about an a

Railway track is made of steel segments separated by small gaps to allow for linear expansion. The segment of track is 1

A wire under tension 225 N produces 6 beats per second when it is tuned with a fork. When the tension changes to 256 N ,

In the third orbit of hydrogen atom the energy of an electron ' $E$ '. In the fifth orbit of helium $(Z=2)$ the energy o

At S.T.P., the mean free path of gas molecule is 1500 d , where ' $d$ ' is diameter of molecule. What will be the mean f

Three charges are placed at the vertices of an equilateral triangle as shown in the figure. For what value of charge ' $

One mole of an ideal gas at an initial temperature of ' $T$ ' $K$ does ' $6 R$ ' of work adiabatically. If the ratio of

In a Young's double slit experiment, the source is white light. One of the holes is covered by a red filter and another

Glycerine of density $1.25 \times 10^3 \mathrm{~kg} / \mathrm{m}^3$ is flowing in conical shaped horizontal pipe. Crosss

In an NPN transistor $10^{10}$ electrons enter the emitter in $10^{-6} \mathrm{~s}$ and $2 \%$ electrons recombine with

Velocity of sound waves in air is $330 \mathrm{~m} / \mathrm{s}$. For a particular sound wave in air, path difference of

A particle is performing uniform circular motion along the circumference of the circle of diameter 1 m with frequency 4

A uniformly charged conducting sphere of diameter 14 cm has surface charge density of $40 \mu \mathrm{Cm}^{-2}$. The tot

The acceleration of a moving body can be found from

Two identical current carrying coils with same centre are placed with their planes perpendicular to each other. If curre

The frequency ' $v_{\mathrm{m}}$ ' corresponding to which the energy emitted by a black body is maximum may vary with th

The resistances in the left and right gap of a metre bridge are $40 \Omega$ and $60 \Omega$ respectively. When the bridg

The magnitude of gravitational field at distance ' $r_1$ ' and ' $r_2$ ' from the centre of a uniform sphere of radius '

Three masses $500 \mathrm{~g}, 300 \mathrm{~g}$ and 100 g are suspended at the end of spring as shown in figure and are

The electrostatic potential inside a charged spherical ball is given by $\mathrm{V}=\mathrm{ar}^2+\mathrm{b}$ where ' r

In the given circuit, when $S_1$ is closed, the capacitor gets fully charged. Now $\mathrm{S}_1$ is open and $\mathrm{S}

A plane mirror produces a magnification of

The work function of metal ' $A$ ' and ' $B$ ' are in the ratio $1: 2$. If light of frequency ' $f$ ' and ' $2 f$ ' is i

The telescopes, for a given wavelength, the objectives with large aperture are used for

A circuit having a self inductance of 1 henry carries a current of 1 A . To prevent the sparking when the circuit is bro

An air column in a closed organ pipe vibrating in unison with a fork, produces second overtone. The vibrating air column

At certain place a magnet makes 30 oscillations per minute. At another place if the magnetic induction is increased by t