List of top Physics Questions

A capacitor of capacitance 5μF is charged by a battery of emf 10V. At an instant of time, the potential difference across the capacitors is 4V and the time rate of change of potential difference across the capacitor is 0.6 Vs^-1. Then the time rate at which energy is stored the capacitor at the instant is

Two coherent waves are represented by $ y_1 = a_1 \cos \omega t $ and $ y_2 = a_2 \sin \omega t $, and they are superimposed on each other. The resulting intensity is proportional to:

An AC circuit has a resistance of 150 $\Omega$, inductive reactance of 250 $\Omega$, and capacitive reactance of 100 $\Omega$. What is the phase difference between current and voltage?

Explain clearly, with examples, the distinction between :

magnitude of displacement (sometimes called distance) over an interval of time, and the total length of path covered by a particle over the same interval;
magnitude of average velocity over an interval of time, and the average speed over the same interval. [Average speed of a particle over an interval of time is defined as the total path length divided by the time interval]. Show in both (a) and (b) that the second quantity is either greater than or equal to the first. When is the equality sign true ? [For simplicity, consider one-dimensional motion only].

An object of size 3.0 cm is placed 14cm in front of a concave lens of focal length 21cm. Describe the image produced by the lens. What happens if the object is moved further away from the lens?

An aeroplane is flying from city $ A $ to city $ B $ along path $ 1 $ . The path $ 1 $ is a circular arc whose centre coincides with the centre of the earth. Another aeroplane is flying along path $ 2 $ from $ A $ to $ B $ . The path $ 2 $ is circular arc whose centre is at $ C $ . $ O $ is the centre of the earth. Then,

Two point charges +2C and +6C repel each other with a force of 12 N. If a charge of - 2C is given to each of these charges the force will now be

A thin straight vertical conductor has 10 amp current flows vertically upwards. It is present at a place where $B_H = 4 \times 10^{-6}T$ . Arrange the net magnetic induction at the following points in ascending order a) at 0.5m on south of conductor b) at 0.5ra on west of conductor c) at 0.5m on east of conductor d) at 0.5m on north-east of conductor

Among the given pair of vectors, the resultant of two vectors can never be 3 units. The vectors are

A ray of light passes through a glass slab with refractive index $ n = 1.5 $ at an angle of incidence of $ 30^\circ $. What is the angle of refraction inside the glass? (Use $ \sin 30^\circ = 0.5 $)

We have carefully distinguished between average speed and magnitude of average velocity. No such distinction is necessary when we consider instantaneous speed and magnitude of velocity. The instantaneous speed is always equal to the magnitude of instantaneous velocity. Why?

A bullet from a gun is fired on a rectangular wooden block with velocity u. When the bullet travels 24 cm through the block along its length horizontally, velocity of the bullet becomes $\frac{u}{3}$.Then it further penetrates into the block in the same direction before coming to rest exactly at the other end of the block. The total length of the block is

An athlete runs along a circular track of diameter 80m. The distance travelled and the magnitude of displacement of the athlete when he covers $\frac{3^{th}}{4}$ of the circle is ( in m)

A spherical conductor of radius 12 cm has a charge of 1.6 × 10^–7C distributed uniformly on its surface. What is the electric field ?