List of top Physics Questions

First order derivation of thermo emf produced in thermo-couple with respect to temperature gives ........

The de-Broglie wavelength associated with a particle moving with momentum $(p)$ and mass $(m)$ is

The deflection in a moving coil galvanometer falls from 50 divisions to 10 divisions,when a shunt of $ 2? $ is connected with it. The resistance of galvanometer coil is

Two electric bulbs are connected one by one across potential difference V. At that time power consumed in them are $P_1 \, and \, P_2 $ respectively. Now, if potential difference V is applied across series combination of these bulbs, what will be total power consumed ?

The internal resistance of a cell of emf 4 V is $ 0.1 \Omega $ It is connected to a resistance of $ 3.9 \Omega $. The voltage across the cell will be

The ratio of cross-sectional areas of two conducting wires made up of same material and having same length is 1 : 2. What will be the ratio of heat produced per second in the wires, when same current is flowing in them?

Colours in thin films are due to

A rocket of mass $100 \,kg$ burns $0.1\, kg$ of fuel per sec. If velocity of exhaust gas is $1 \,km/s^{-1}$, then it lifts with an acceleration of

A beaker of radius $15\, cm$ is filled with a liquid of surface tension $0.75\, N/m$. Force across an imaginary diameter on the surface of the liquid is

Force required to move a mass of $1 \,kg$ at rest on a horizontal rough plane ( $ \mu =0.1 $ and $ g=9.8\,m{{s}^{2}} $ ) is

A shell of mass $10\, kg$ is moving with a velocity of $ 10\,ms^{-1}$ when it blasts and forms two parts of mass $9 \,kg$ and $1 \,kg$ respectively. If the $1^{st}$ mass is stationary, the velocity of the $ 2^{nd} $ is

Identify the INCORRECT statement regarding a superconducting wire

A certain radioactive material $_{Z} X ^{A}$ starts emitting $\alpha$ and $\beta$ particles successively such that the end product is $_{z-3} Y ^{A-8}$. The number of $\alpha$ and $\beta$ particles emitted are

A particle shows distance - time curve as given in this figure. The maximum instantaneous velocity of the particle is around the point

An electric kettle takes 4 A current at 220 V. How much time will it take to boil 1 kg of water from temperature $20^\circ C ?$ The temperature of boiling water is $100^\circ C $

A current of 3 amp. flows through the $2\, \Omega$ resistor shown in the circuit. The power dissipated in the $5\, \Omega$ resistor is

In gamma ray emission from a nucleus

A simple pendulum is suspended from the ceiling of a lift. When the lift is at rest its time period is $T$. With what acceleration should the lift be accelerated upwards in order to reduce its period to $T/2$ ? (g is acceleration due to gravity).

The magnetic field at the centre of a circular current carrying conductor of radius $r$ is $B_c$. The magnetic field on its axis at a distance $r$ from the centre is $B_a$. The value of $B_c : B_a$ will be

The equivalent resistance between the points $A$ and $B$ will be (each resistance is 15 $\Omega$)

The masses of two radioactive substances are same and their half lives are $1$ year and $2$ years respectively. The ratio of their activities after 6 years will be

The communication using optical fibers is based on the principle of

$K_{\alpha} $ and $K_{\beta} x-$ rays are emitted when there is a transition of electron between the levels

In the circuit shown above, an input of \(1\,V\) is fed into the inverting input of an ideal Op-amp \(A\). The output signal \(V_{\text{out}}\) will be

In Colpitt oscillator the feedback network consists of