List of top Physics Questions

The electron in hydrogen atom undergoes transition from higher orbits to an orbit of radius \(476.1 \text{ pm}\). This transition corresponds to which of the following series?
The current I in the circuit shown below is: (All diodes are ideal and identical)
The work done by a centripetal force is:
Each side of a metallic cube of mass 5.580 kg is measured to be 9.0 cm. Keeping the significant figures in view, the density of the material of the cube can be best expressed as X $\times$ 10³ kg m⁻³, where the value of X is: ____.
A Carnot engine uses diatomic gas as a working substance. During the adiabatic expansion part of the cycle, if the volume of the gas becomes 32 times its initial volume, then the efficiency of the engine is
For which of the following Reynold's number, a flow is streamlined?

एक 5 kg द्रव्यमान के पिण्ड पर, जब दो परस्पर लंबवत बल 8 N और 6 N आरोपित किए जाते हैं, तो उत्पन्न त्वरण के परिमाण और दिशा क्रमशः होंगे: 
 

A particle performs SHM with an amplitude of 5 cm. Find its acceleration when it is 3 cm from the mean position (assume \( \omega = 2 \, \text{rad/s} \)).

Five identical springs are used in the three configurations as shown in figure. The time periods of vertical oscillations in configurations (a), (b) and (c) are in the ratio. 

 

Unit of power is :
SI unit of force is :
Work done=?
Which Instrument measures electric current?
Speed of Light in vacuum is :
A train starting from rest attains a velocity of 72 km/h in 5 minutes. Assuming that the acceleration is uniform. The distance travelled by train for the above velocity is
Which one of the following is the extensive property of a thermodynamic system?
A battery of emf 10 volts and internal resistance 3 \(\Omega\) is connected to a resistor. If the current in the circuit is 0.5 A, what is the resistance of the resistor?
A concave mirror is used to form an image of an object. The object distance (u) is 30 cm and the image distance (v) is 15 cm. Calculate the focal length (f) of the mirror.
A self-locking screw is one which
In a mechanical refrigeration system, the highest temperature of refrigerant occurs
An electron falls through a distance 1.5 cm in a uniform electric field of magnitude 2.0 \(\times\) 10\(^4\) N/C from rest. The time taken to cover this distance in second is \textunderscore\textunderscore\textunderscore\textunderscore\textunderscore.
(e = 1.6 \(\times\) 10\(^{-19}\) C, m\(_e\) = 9.11 \(\times\) 10\(^{-31}\) kg)
A p-n junction in reverse bias:
The volume of a small ball is calculated to be $25 \text{ cm}^3$ and it weighs $30 \text{ g}$ in air. Will this ball float or sink in water?
A toy car is moving in a straight line at a speed of 6 cm/s and comes to rest after a minute. How far has it traveled?
The magnetic field around a current-carrying solenoid is similar to the magnetic field of a: