List of top Physics Questions

If a sound wave emitted by a stationary source of frequency 680 Hz travels towards a stationary observer 150 m away, then the number of waves between the source and observer are (speed of sound in air = 340 m s\(^{-1}\))
The efficiency of a Carnot engine operating between the temperatures 1000 K and 300 K is
The slope of kinetic energy (on y-axis) and linear displacement (on x-axis) graph of a body gives the rate of change of:
If the measured values of the voltage across and the current through a resistor are \((100 \pm 5)\,V\) and \((10 \pm 0.2)\,A\) respectively, then the error in the determination of the resistance is:
For a particle moving in x-y plane, if at any instant of time ‘t’ (in second) its displacements (in metre) are \(x=2t^{2}-t\) and \(y=4t^{2}-4t\), then the velocity of the particle at a time \(t=1\,s\) is:
If a ball released from a height \(H\) takes a time \(T\) to reach the ground, then the position of the ball from the ground at a time \(\frac{T}{2}\) is:
If a body is thrown vertically upwards from the ground with a velocity of 20 m/s, then its displacement during the last second of upward motion is (Acceleration due to gravity \(g=10\,m/s^2\)):
If the time taken for a block to slide down a smooth inclined plane of angle of inclination $30^\circ$ is 4 s, then the time taken by the block to slide down a rough inclined plane of the same length and same angle of inclination is
(The coefficient of kinetic friction between the inclined plane and the block = $0.28/\sqrt{3}$)
A body of mass 6 kg is moved with uniform speed on a rough horizontal surface through a distance of 200 cm. If the coefficient of kinetic friction between the surface and the body is 0.1, then the work done against friction is (Acceleration due to gravity \(g = 10\, m/s^2\)):
A 10-ohm resistor carries a current of 2 A. What is the power dissipated?

Which of the following statements is true regarding static friction?

What is the amount of heat required to raise the temperature of 100 g of water from 30°C to 80°C? (Specific heat of water = 4.2 J/g°C)
Two capacitors of 4 $\mu$F and 6 $\mu$F are connected in series. Their equivalent capacitance is:
The value of acceleration due to gravity on the Moon is about $ \frac{1}{6} $ that on Earth. If an object weighs 60 N on Earth, its weight on the Moon is:
In the Bohr model of hydrogen atom, the angular momentum of the electron is:
If the velocity–time graph of a body is a straight line inclined to the time axis, the motion has:
An object is placed 10 cm in front of a concave mirror of focal length 15 cm. The image formed is:
A wave travels along a string with a frequency of 50 Hz and wavelength of 2 m. What is its speed?
A current-carrying straight conductor produces a magnetic field. The direction of the field is given by:
A body of mass 2 kg is raised to a height of 5 m. What is the potential energy gained? (Take $ g = 10 \, \text{m/s}^2 $)
A block is resting on a rough horizontal surface. A force is applied horizontally, but the block does not move. What can be said about the frictional force acting on it?
If the temperature of an ideal gas is doubled at constant pressure, what happens to its volume?
A wire of resistance 10 \(\Omega\) is stretched to twice its original length. What is the new resistance?
Which logic gate is represented by the following combination of logic gates?
logic gate is represented by the following combination of logic gates
A particle of mass \( m \) and charge \( q \) is fastened to one end \( A \) of a massless string having equilibrium length \( l \), whose other end is fixed at point \( O \). The whole system is placed on a frictionless horizontal plane and is initially at rest. If a uniform electric field is switched on along the direction as shown in the figure, then the speed of the particle when it crosses the x-axis is:
A particle of mass m and charge q