Explore topic-wise InterviewSolutions in Current Affairs.

Two bodies are dropped from the same height at the same time on the surface on the moon. They will have

Consider iron and water. In ___sound travels faster.

For class 1 lever, which of the following statement is true?

A convex lens of focal length 40 cm and a concave lens of focal length 25 cm are placed in contact in such a way that they have the common principal axis. Find the power of the combination. What is the type of lens formed by their combination? [4 MARKS]

The curvature of the eye lens can be modified by

Experimental investigations show that the intensity of solar radiation is maximum for a wavelength $480nm$ in the visible region. Estimate the surface temperature of the sun. Given Wien's constant, $b=2.88\times {10}^{-3}mK$.

Question 26
A current of 1 ampere flows in a series circuit containing an electric lamp and a conductor of 5 $\Omega$ when connected to a 10 V battery. Calculate the resistance of the electric lamp.
Now if a resistance of 10 $\Omega$ is connected in parallel with this series combination, what change (if any) in current flowing through 5 $\Omega$ conductors and the potential difference across the lamp will take place? Give reason.

Critical angle is that angle of incidence in the denser medium for which the angle of refraction in rarer medium is

(i) What is refraction?

(ii) How can sunrise and sunset be thought of as an example of refraction?

In which direction does the force need to be applied when single pulley is used with a mechanical advantage greater than1 ? How can u change the direction of force applied without altering its ma

A certain wire has a resistance R. The resistance of another wire identical with the first and having twice its diameter is;

The movement of free electrons in a metal when potential difference is applied across it is

1. 16.5

V=IR, from this equation it's clear that V is directly proportional to I and R..
I=V/R, from this equation it's clear that I is directly proportional to V and inversely proportional to R.
But when V is directly proportional to R and I is directly proportional to V then why is I not directly proportional to R?

(a) Name any five sources of water (other than rivers)
(b) Describe how the water of the river Ganga has been highly polluted.

(a) What is an electric current? What makes an electric current flow in a wire?
(b) Define the unit of electric current (or Define ampere).

Two bodies A and B having masses 6 kg and 3 kg respectively are at rest on a smooth surface. A force F is applied on both the bodies to produce linear motion. Which body will move with a greater speed and why?

Define the term velocity ratio. State its unit.

The electric current existing in a discharge tube is 2.0 $\mu A$. How much charge is transferred across a cross-section of the tube in 5 minutes ?

What is the relationship between the focal length f and radius of curvature R for a spherical mirror?

Which of the following is the correct energy change taking place in a Nuclear power plant?

A magnetic field has which of the following properties:

1. Magnitude
2. Direction
3. Colour

The chief energy transformation that occurs in a loudspeaker is

Example: The bob $A$ of a pendulum released from ${30}^{\circ }$ to the vertical hits another bob $B$ of the same mass at rest on table as shown in figure. How high does the bob $A$ rise after the collision? Neglect the size of the bob and assume the collision to be elastic.

Amount of light entering in human eye is controlled by:

Damping force on a system executing S.H.M is

For a body in uniform circular motion, (if we are rotating a stone using our hand tied by a thread ) which all real forces act ? The centripetal force will be because of the tension in the string, but which is the real force that causes the circular motion as centripetal (tension) force acts inwards . so which Real force causes such a motion( as centrifugal force is only imaginary )

An insulating rod of length l carries a charge q distributed uniformly on it. The rod is pivoted at an end and is rotated at a frequency f about a fixed perpendicular axis. The magnetic moment of the system is

Name the seven prominent colours of the white light spectrum in order of their increasing frequencies.

In the given figure, the object distance is and radius of curvature of the mirror is .

Explain the working of ammeter and voltmeter. What is ammeter connected in series and why voltmeter in parallel?

Ram has LED of resistance $10\Omega$ which will only light up if the current provided is $1A$. Below $1A$ current it won't light up, above that the LED will burst. He also has 10 two volt cells. Find out how many cells will Ram need to light up the LED?

Why illusion are happening in our eyes

1 astronomical unit is equal to:

List some of the important features of Hubble Space Telescope.

Explain why, despite good rains, we are not able to meet the demand for water of all the people in our country.

(a) What is a natural resource? Name three important natural resources.
(b) Why do we need to manage our natural resources?

Which of the following diagrams shows the ray of light refracted correctly ?

Velocity of light in glass is $2\times {10}^{8}m{s}^{-1}$ and in air is $3\times {10}^{8}m{s}^{-1}$. If the ray passes through glass to air, calculate the value of critical angle.

The energy conversion that takes place during the working of a dc motor is

The shape of the earth's magnetic field resembles that of an imaginary:

(a) U-shaped magnet

(b) Straight conductor carrying current

(c) Current-carrying circular coil

(d) Bar magnet

If you are standing between 2 mirrors and you see 3 images of yourself then, find out the angle at which these mirrors are inclined to each other.