Explore topic-wise InterviewSolutions in .

A cylinder containing water up to a height of 25 cm has a hole of cross-section $\frac{1}{4}c{m}^2$ in its bottom. It is counterpoised in a balance. What is the initial change in the balancing weight when water begins to flow out

What is the current $\left(I\right)$ in the circuit?

Choose the incorrect statement regarding wind power:

1. It is expected to harness wind power to maximum and not minimum in open spaces

2. The source of wind power is the potential energy content of the wind blowing at high altitudes

3. The rotation of the blades is possible when the wind hits them

4. Wind energy is used in running the turbine of an electric generator

With what speed in miles/hr must an object be thrown vertically upwards to reach a height of 91.5m.

A uniform rod of length $200\text{cm}$ and mass $500\text{g}$ is balanced on a wedge placed at $40\text{cm}$ mark. A mass of $2\text{Kg}$ is suspended from the rod at $20\text{cm}$ and another unknown mass ${}^{\prime }{m}^{\prime }$ is suspended from the rod at $160\text{cm}$ mark as shown in the figure. Find the value of $m$ such that the rod is in equilibrium.

$(g=10{\text{ms}}^{-2})$

The density-distance graph of a sound wave is given below. Choose the correct displacement-distance graph among the following.

The materials that resist the flow of electric current are called_________.

Study the following scenarios and identify what type of inertia tends to resist the change.

1. When the bus suddenly starts, the passenger on the bus tends to fall backwards.

2. When a passenger jumps out of moving bus, he falls down.

3. A cyclist riding on a level road does not come to rest immediately even he stops pedalling.

An object $\left(ABED\right)$ is placed in front of a concave mirror beyond the centre of curvature $\left(C\right)$ as shown in the figure. The shape of image will be :

(Consider $DE$ and $AB$ as extended objects)

The electric fields of two plane electromagnetic plane waves, in vacuum, are given by,

$\overrightarrow{E_1}=E_0\hat{j}\cos (\omega t-kx)$ and, $\overrightarrow{E_2}=E_0\hat{k}\cos (\omega t-ky)$.

At $t=0$, a particle of charge $q$ is at origin with a velocity $\overrightarrow{v}=\left(0.8c\right)\hat{j}$ (Here, $c$ is the speed of light in vacuum). The instantaneous force experienced by the particle is:

Give the action and reaction in the following -

1.Walking

2.Swimming

3.Launching of rocket

4.Rowing of boat

5.Stepping out of a boat

6.Uplifting of birds

An $1575kg$ car skids to a stop across a horizontal surface over a distance of $45m$. The frictional force acting on the car is $7000N$. What is the initial velocity of the car?

Two objects having masses in the ratio 3 : 4 have the same magnitude of momentum. Their kinetic energies must be in the ratio

Th tires of a bus or a car are larger in size than the car. Why

A stone is released from some height, it moves towards the earth. Does the earth also move towards the stone ?

The flight of a bird is associated with which Newton's law of motion. Give a suitable example to justify your answer.

An aeroplane with wing span $50\text{m}$ is flying horizontally over a place where the vertical component of the earth's magnetic field is $2\times {10}^{-4}{\text{Wbm}}^{-2}$. The potential difference between the tips of the wings is $1\text{V}$. The speed of the aeroplane is

The charge on an electron is:

If we know the mavnitmag of net force acting on a body of a given en mass initially at rest, with help of Newton second law, we can determine its

Why do we multiply velocity and mass to find momentum and not add or divide or any other mathematical operation is performed?

Name the quantity whose one of the units is pascal (Pa).

Potential energy and kinetic energy are types of:

If we drop three watermelons weighing $2\text{kg}$, $4\text{kg}$ and $6\text{kg}$ respectively from the same height and at the same time, which one of it will reach the ground first? (Given: negligible air resistance)

The major constituents of an ecosystem are ____ and ____.

A body of mass 1 kg moving with velocity of 4 metre per second collides with a body of mass 0.5 kg moving with a velocity of 2m per second if the velocity of the first body after collision is 8/3 metre per second find the velocity of the second body after collision

Question 3

A positively-charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is

(a) towards south

(b) towards east

(c) downward

(d) upward