Explore topic-wise InterviewSolutions in Current Affairs.

The black conductor is carrying a current in vertically upward direction and a magnet is placed next to it as shown. Now it is known that the magnet experiences force. What should be the direction of current in another wire (shown in green) in order to keep the magnet in place? (Consider the force only on the north pole)

If the potential difference between the ends of a fixed resistor is halved the electric power will become.

(A) Four times

(B) One-Fourth

(C) Double

(D) Half

Are all stars white? If not, then why they all appear white at night.

What are the uses/application and limitations of dimensional method

What do we call the branches of tall trees that looks like the roof over the other plants?

The table given below shows the number of protons and number of neutrons present in the nuclei of elements P and Q:

$$\begin{array}{ccc}Nuclei& Numberofprotons& Numberofneutrons\\ P& 1& 1\\ Q& 1& 2\end{array}$$

Calculate the mass number of P and Q. What is the relation between P and Q? Which element do they represent?

The masses and radii of the earth and moon are$M_1$, $R_1$ and $M_2$, $R_2$ respectively. Their centres are a distance d apart. The minimum speed with which a particle of mass m should be projected from a point midway between the two centres so as to escape to infinity is given by

A converging lens has a focal length of 50 cm. The power of this lens is : (a) + 0.2 D (b) - 2.0 D (c) + 2.0 D (d) - 0.2 D

At what distance should an object be placed from a convex lens of focal length 18 cm to obtain an image at 24 cm from it on the other side ? What will be the magnification produced in this case ?

Light travelling from a denser medium. to a rarer medium alone a normal to the boundary : (a) is refracted towards the normal (b) is refracted away from the normal (c) goes along the boundary (d) is not refracted

Suppose the gravitational force varies inversely as the nth power of distance. Then the time period of a planet in circular orbit of radius R around the sun will be proportional to:

(a) What is a nuclear reactor ? What is the fuel used in a nuclear reactor ?
(b) With the help of a labelled diagram, describe the working of a nuclear power plant.
(c) How is the working nuclear reactor of a power plant shut down in an emergency ?
(d) Name five places in India where nuclear power plants are located.

In a single fixed pulley, if the effort moves by a distance x downwards, by what height is the load raised upwards ?

State right hand thumb rule which describes the direction of magnetic field around a current carrying wire.

When the ice from a frozen lakes starts to melt, the temperature of the surroundings ______.

Acid rain is caused by the excess?

How do water droplets acts like prism?

The refractive index of dense flint glass is 1.65 and that of alcohol is 1.36 both with respect to air. What is the refractive index of flint glass with respect to alcohol?

Name two kinds of energy losses in a transformer. How are they minimised?

Explain potential difference by illustrating it and give example.

An object placed in one medium when seen from the other medium, it appears to be vertically shifted. Which of the following factors determines the magnitude of shift?

When an electic current is passed through any wire, a magnetic field is produced around it . Then why an electric iron connecting cable does not attract nearby iron objects when electric current is switched on through it ?

If the earth had no atmosphere and there would not have been any scattering then sky would appear as

The relation between absolute scale of temperature and Celsius scale of temperature is given by

The power of a lens is negative if ................... the rays.

A ray of light is incident at ${60}^{\circ }$, on the glass-air interface. Then the light ray will be ___.

Use : $[{\mu }_w=\sqrt{2}$ , ${\mu }_a=1]$

Refractive index of diamond with respect to glass is 1.6 and absolute refractive index of glass is 1.5. find out the absolute refractuve index of diamond?

Can we also see a rainbow on a sunny day? Give situation to support your answer.

Consider a two particle system with the particles having masses \(m_1 and m2\) . If the first particle is pushed towards the centre of mass through a distance 'd', by what distance should the second particle be moved, so as to keep the centre of mass at the same position?

An object is $11km$ below sea level. A research vessel sends down a sonar signal to confirm this depth. After how long can it expect to get the echo? (Take the speed of sound in seawater as $1,520m/s$)

Which of the following gas is released by the usage of petroleum and coal but not poisonous?

A boy lifts a load of 400 N through a vertical height of 5 m by a fixed pulley by applying an effort of 480 N at the other end.
Find the efficiency.

What is the relation between the load and the effort in the pulley system shown below:

The subjective property of sound related to its frequency is

In a house 5 CF lamps each of 24 W works for a period of 5 hours and 2 fans of 80 W for 5 hours. What is the electric consumption in kWh for a month?

The correct relationship betwen the mechanical advantage (M.A.), the velocity ratio (V. R.) and the efficiency $\eta$ is :

(a) $M.A=\eta \times V.R.$ (b) $V.R=\eta \times M.A$

(c)$\eta =M.A\times V.R$ (d) none of these.

The priority order of the following substituent will be:

-OCH₃ ; -N(CH₃)₂ ; -CH₃ ; -H

I II III IV

How much is the charge on an electron ?

What's the reason for twinkling of stars?

The mass of a helicopter is 0.5 t. Its engine develops a force of 8500 N before taking off. What is the acceleration of the helicopter at the time of taking off? (Give your answer in ms^-2)

1 Joule per coulomb is the same as _____.