List of top Physics Questions

An object moves with speed $v_1, v_2$ and $v_3$ along a line segment $AB , BC$ and $C D$ respectively as shown in figure Where $AB = BC$ and $AD =3 AB$, then average speed of the object will be:

A wire of length $1 m$ moving with velocity $8 m / s$ at right angles to a magnetic field of $2 T$ The magnitude of induced emf, between the ends of wire will be ______

A body of mass is taken from earth surface to the height $h$ equal to twice the radius of earth $\left(R_e\right)$ the inerease in potential energy will be:( $g$ = acceleration due to gravity on the surface of Earth)

Match List I with List II

List I		List II
A.	Troposphere	I.	Approximate 65-75 km over Earth’s surface
B.	E- Part of Stratosphere	II.	Approximate 300 km over Earth’s surface
C.	F2- Part of Thermosphere	III.	Approximate 10 km over Earth’s surface
D.	D- Part of Stratosphere	IV.	Approximate 100 km over Earth’s surface

Choose the correct answer from the options given below:

A force is applied to a steel wire ' $A$ ', rigidly clamped at one end As a result elongation in the wire is $02\, mm$ If same force is applied to another steel wire ' $B$ ' of double the length and a diameter $24$ times that of the wire ' $A$ ', the elongation in the wire ' $B$ ' will be (wires having uniform circular cross sections)

The graph between two temperature scales $P$ and $Q$ is shown in the figure Between upper fixed point and lower fixed point there are 150 equal divisions of scale $P$ and 100 divisions on scale $Q$ : The relationship for conversion between the two scales is given by:-

For a moving coil galvanometer, the deflection in the coil is $005$ rad when a current of $10 \,mA$ is field is $0,01 \,T$ and the number of turns in the coil is $200$ , the area of each tum (in $cm ^2$ ) is :

The light rays from an object have been reflected towards an observer from a standard flat mirror, the image observed by the observer are:- 
A. Real 
B. Erect 
C. Smaller in size then object 
D. Laterally inverted 
Choose the most appropriate answer from the options given below:

The equivalent resistance between A and B is _________.

According to law of equipartition of energy the molar specific heat of a diatomic gas at constant volume where the molecule has one additional vibrational mode is:-

Match List I with List II

	List I		List II
A.	Young's Modulus (Y)	I.	[M L-1 T-1 ]
B.	Co-efficient of Viscosity (η)	II.	[M L2 T-1 ]
C.	Planck's Constant (h)	III.	[M L-1 T-2 ]
D.	Work Function (ϕ)	IV.	[M L2 T-2 ]

Choose the correct answer from the options given below:

The required height of a TV tower which can cover the population of $603$ lakh is $h$ If the average population density is $100$ per square $km$ and the radius of earth is $6400\, km$, then the value of $h$ will be ______$m$

The energy band gap of semiconducting material to produce violet (wavelength = $4000 \mathring{A}$ ) LED is ______$eV$ (Round off to the nearest integer)

A car is moving with speed of 150km/h and after applying the brake it will move 27m before it stops. If the same car is moving with a speed of one third the reported speed then it will stop after travelling ______m distance.

Statement I : In LCR circuit, by increasing frequency current increases first then decreases.
Statement II : Power factor of LCR circuit is one.
Choose the correct option.

A radioactive nuclei X decays simultaneously to two nuclei Y and Z as:

t_½ is 12 minutes while t'_½ is 3 minutes. Find the time in which nuclei X decays 50%.

Assuming the earth to be a sphere of uniform mass density, the weight of a body at a depth \(d=\frac{R}{2}\) from the surface of earth, if its weight on the surface of earth is 200 N, will be 

Statement (1): A truck and a car moving with equal kinetic energy are stopped by equal retarding force. Both will cover equal distance to stop.
Statement (2): A car moving towards east suddenly changes its direction towards north with same speed. Its acceleration is zero.
In the light of given statements, choose the most appropriate answer from the options given below.

From the photoelectric effect experiment, following observations are made Identify which of these are correct 
A. The stopping potential depends only on the work function of the metal 
B. The saturation current increases as the intensity of incident light increases 
C. The maximum kinetic energy of a photo electron depends on the intensity of the incident light 
D. Photoelectric effect can be explained using wave theory of light 
Choose the correct answer from the options given below:

A wire of length $L$ and radius $r$ is clamped rigidly at one end When the other end of the wire is pulled by a force $F$, its length increases by $5\, cm$ Another wire of the same material of length $4 L$ and radius $4 r$ is pulled by a force $4 F$ under same conditions The increase in length of this wire is ______$cm$

The ratio of wavelengths of proton and deuteron accelerated by potential $V_p$ and $V_d$ is $1: \sqrt{2}$ Then, the ratio of $V_p$ to $V_d$ will be

A metal exposed to light of wavelength $800\, nm$ and emits photoelectrons with a certain kinetic energy The maximum kinetic energy of photo-electron doubles when light of wavelength $500\, nm$ is used The work function of the metal is (Take $hc =1230 \,eV - nm )$

The length of a conductor having resistance 160 Ω, is compressed to 25% of its initial value. The new resistance will be

The magnetic moment of an electron (e) revolving in an orbit around nucleus with an orbital angular momentum is given by :