List of top Physics Questions

Human ear normally hears sounds originating from the vibrating objects with a frequency between

If two simple harmonic motions having angular frequency 440 rad/s and 396 rad/s are superimposed, what will be the number of beats produced?

A white dwarf star has volume V and contains N electrons so that the density of electron is \(n=\frac{N}{V}\). Taking the temperature of the star to be 0 K, what will be the expression for average energy per electron in the star?

The side of a square land was measured as 150m and is in error by 0.05m. What is the corresponding error in the computed area of the land?

Choose the incorrect statement about Atomic absorption spectrometer:

Match List I with List II

LIST I (Characteristic Equation)		LIST II (Nature of Output)
A	\(S^2+18S+64\)	I	Underdamped
B	\(S^2+25\)	II	Critically damped
C	\(S^2+12S+36\)	III	Undamped
D	\(S^2+8S+25\)	IV	Overdamped

Choose the correct answer from the options given below:

A metal has work function \(w_0\) = 3.3×10^-19 J. What should be the minimum frequency of the incident radiation that can remove an electron from the metal surface? [Given h = 6.6x10^-34 J-s]

The Lissajous figure of two rectangular SHMs of equal frequency and phase difference of π/2 is

What is the change in entropy when 10 g of ice at 0 °C is converted into water at the same temperature? The latent heat of ice is 80 cal/g.

Match List I with List II

LIST I (Type of Device)		LIST II (Characteristics/ Application)
A	GTO	I	Triggering Circuit
B	UJT	II	Turn off by negative pulse rate
C	TRIAC	III	High Speed Switching
D	MOSFET	IV	Bidirectional Switching

Choose the correct answer from the options given below:

If \(I_0\) is the intensity of the principal maxima in a single slit diffraction pattern, then what will be its intensity when the slit width is doubled?

Figure shows Fraunhofer's diffraction due to a single slit. If first minima is obtained in the direction shown, then the path difference between ray 1 and ray 3 is

Five Carnot engines operate between reservoir temperatures of
A. 100 K and 500 K
B. 200 K and 500 K 
C. 400 K and 500 K 
D. 200 K and 800 K
E. 200 K and 400 K 
Arrange the engines according to their decreasing efficiencies.
Choose the correct answer from the options given below.

Find \(R_{ equivalent}\) of the given circuit.

In terms of total primary energy consumption. At present India stands at what position?

If three forces acting on a rigid body are in equilibrium, then they must:

The true length of a line is known to be 200m. When this is measured with a 20m tape, the length is 200.80m. The correct length of the 20m tape is.

Match List I with List II

LIST I		LIST II
A	Voltage Stability	I	Power system stabilizer
B	Transient stability	II	Damping Power
C	Oscillatory instability	III	Angle stability
D	Study-state dynamics	IV	Reactive power

Choose the correct answer from the options given below:

The Bose-Einstein distribution is applied on

If n observations are taken, then accidental errors are proportional to.

In Force current analogy, stiffness constant K is analogous to__

The two lines AB and CD shown in h-s curve are, respectively:

The Lissajous figure may be a straight line if the phase difference is

Whenever two objects collide, the force generated is known as

If \(\hat{n_1}, \hat{n_2}\)are two unit vectors and \(\theta\) is the angle between them, then \(\cos\frac{\theta}{2}\) is equal to