List of top Physics Questions

The fundamental frequency of an open organ pipe is 300 Hz. The first overtone of this pipe has the same frequency as the first overtone of a closed organ pipe. If the speed of sound is 330 m/s, then the length of the closed organ pipe is:
An air bubble of volume v₀ is released by a fish at depth h in a lake. The volume of bubble just before reaching the surface will be:
Which of the following expressions corresponds to simple harmonic motion along a straight line, where x is displacement and a,b,c are positive constants?
The molecules of a gas have rms velocity 200 m/s at 27°C. Find rms velocity at 127°C if pressure is constant.
The radiation emitted by a perfectly black body is proportional to:
A geo-stationary satellite is one which:
A copper sphere cools from 62°C to 50°C in 10 minutes and to 42°C in next 10 minutes. Calculate the temperature of surroundings.
Two wires of same material and same volume have cross-sectional areas A and 2A. If the first wire is elongated by Δ x under force F, the force required to stretch the second wire by the same amount is:
An iron rod of length 2 m and cross-sectional area 50 mm² is stretched by 0.5 mm by hanging a mass of 250 kg. The Young’s modulus of iron is:
Viscosity is the property of a liquid due to which it:
A constant torque of 31.4 N-m is exerted on a pivoted wheel. If angular acceleration of wheel is 4 rad s⁻², then the moment of inertia of the wheel is:
If T = 2π √ML³3Yq, then find the dimensions of q. Where T is the time period of a bar of mass M, length L, and Young’s modulus Y.
An object experiences a net force and accelerates from rest to its final position in 16 s. How long would the object take to reach the same final position from rest if the object’s mass was four times larger?
A man of mass m starts falling towards a planet of mass M and radius R. Inside the planet, which consists of a spherical shell of mass 2M/3 and a point mass M/3 at centre, the change in gravitational force experienced by the man is:
A particle is moving in a straight line with initial velocity and uniform acceleration. If the sum of the distance travelled in tᵗᵉˣᵗᵗh and (t+1)ᵗᵉˣᵗᵗh</ˢᵗʳoⁿg> seconds is 100 cm, then its velocity after t seconds, in cm/s, is:
The two vectors A and B are drawn from a common point and C = A + B. The angle between A and B is:
A passenger in an open car travelling at 30 m/s throws a ball out over the bonnet. Relative to the car, the initial velocity of the ball is 20 m/s at 60^ to the horizontal. The angle of projection of the ball with respect to the horizontal road will be:
An ammeter reads up to 1 A. Its internal resistance is 0.81 \( \Omega \). To increase the range to 10 A, the value of the required shunt is:
A 2 V battery, a 15 \( \Omega \) resistor, and a potentiometer of 100 cm length are connected in series. If the resistance of potentiometer wire is 5 \( \Omega \), then the potential gradient of the potentiometer wire is:
A coil of resistance 100 \( \Omega \) and inductance 5 H is connected to a 100 V battery. Then the energy stored in the coil is:
A nucleus \( _{Z}^A X \) emits an \( \alpha \)-particle. The resultant nucleus emits a \( \beta^- \)-particle. The respective atomic and mass numbers of final nucleus will be:
Polarising angle for water is \( 53^\circ 4' \). If light is incident at this angle on the surface of water and reflected, the angle of refraction is:
The output voltage of a transformer connected to a 220 V line is 1100 V at 2 A current. Its efficiency is 100%. The current coming from the line is:
In Young's double slit experiment, the intensity of light at a point on the screen where the path difference is \( \lambda \) is:
Five resistances are connected as shown in the figure. The effective resistance between points A and B is: