List of top Physics Questions

Body A of mass 4m moving with speed u collides with another body B of mass 2m, at rest. The collision is head on and elastic in nature. After the collision the fraction of energy lost by the colliding body A is:
The displacement of a particle executing simple harmonic motion is given by \(y=A_0+A sin\omega t+Bcos\omega t.\) Then the amplitude of its oscillation is given by:
Increase in temperature of a gas filled in a container would lead to:
A parallel plate capacitor of capacitance \(20 μF\) is being charged by a voltage source whose potential is changing at the rate of \(3 V/s.\) The conduction current through the connecting wires, and the displacement current through the plates of the capacitor, would be, respectively:
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The correct Boolean operation represented by the circuit diagram drawn is :
The speed of a swimmer in still water is \(20 m/s\). The speed of river water is \(10 m/s\) and is flowing due east. If he is standing on the south bank and wishes to cross the river along the shortest path, the angle at which he should make his strokes w.r.t. north is given by:
When an object is shot from the bottom of a long smooth inclined plane kept at an angle \(60 \degree\)with horizontal, it can travel a distance \(x_1\) along the plane. But when the inclination is decreased to \(30 \degree\) and the same object is shot with the same velocity, it can travel \(x_2\) distance. Then \(x_1:x_2\) will be:
Two point charges A and B, having charges. +Q and -Q respectively, are placed at certain distance apart and force acting between them is F. If 25% charge of A is transferred to B, then force between the charges becomes:
A hollow metal sphere of radius R is uniformly charged. The electric field due to the sphere at a distance r from the centre :
Which of the following acts as a circuit protection device?
A cylindrical conductor of radius R is carrying a constant current. The plot of the magnitude of the magnetic field, B with the distance, d, from the centre of the conductor, is correctly represented by the figure :
The earth?s mass is $ 80 $ times that of moon and their diameters are $ 1600 \,km $ and $ 800 \,km $ , respectively. If $ g $ is the value of acceleration due to gravity on earth, what is its value on moon?
The refractive index of glass with respect to air is 2. The critical angle at their interface i
If 'a' is the thickness of the glass slab and 'b' is the vertical shift of an object through it, then refractive index of the glass slab is
When we sit at a camp fire, objects beyond the fire are seen swaying. The principle involved in it is
The magnification of an object of height 1 m using a spherical mirror is 1.5. The size of the image is
Which among the following is not a physical quantity?
A clock shows 3 hr 5 min. When seen through a plane mirror, the time appears to be
If T1 and T2 are the temperatures of the hotter and colder water samples respectively and Tis the final temperature of their mixture, then
Condensation is a change of phase from
Which among the following statements on temperature is false?
A temperature of -273 °C in Kelvin scale is
A force exerted on a 3 m long conductor having a current of 2 A in 0.4 T magnetic induction with an angle of 30° is
Generally, right-hand rule is used when the velocity and magnetic field are
Which of the following pair of devices measure the same physical quantity?