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Why do meteorites burn when entering into the atmosphere

Distilled water does not conduct electricity. What substances can be added to distilled water in small amounts to make it a good conductor of electricity ? Why ?

A piece of wood of mass 150 g has a volume of 200 $c{m}^3$.Find the density of wood in

(a) C.G.S.unit (b) S.I unit

Which of the following position-time graphs represents a constant velocity motion?

The position is represented by 'x' and time is represented by 't'.

What type of spherical mirror is obtained by painting the outer surface of the sphere?

In which of the following options is regular reflection taking place?

Which of the following is incorrect?

There are 3 boxes A, B & C of equal masses, same material and similar surface condition, but of different shapes, kept on a rough floor. The surface area of box in contact with the floor varies as C>B>A i.e. box C has the maximum surface area in contact with the floor followed by B and A respectively. Then choose the correct statement

Fill in the blanks

If force increases, pressure ___________________

Out of two, which one would make a higher pitch and why?

1) A post card , rubbed slowly against a comb?

2) A sandpaper , rubbed rapidly against a comb?

Is there any other force of friction acting on us while running apart from frictional force of the road ?

Why does a papad when suspended in boiling oil become crispier??

The area of given figure is.

Dipole-dipole interaction energy between stationary polar molecules is:

Definition of pascals.

For the image formed by a mirror, the left of the object appears on the right and the right appears on the left. This is known as ___.

Which of the following actions can be termed as pulling?

Three beakers 1, 2 and 3 of different shapes are kept on a horizontal table and filled with water up to the same height h. If the pressure at the base of beakers are $P_1$, $P_2$ and $P_3$ respectively, which of the following is the correct relation between them?

Whatis difference between force and moment of force (3 points)

And differences between Force and pressure (3 points)

The ___________ of water enables aquatic animals to survive in a reservoir where the surface layer of water has frozen.

A construction worker’s helmet slips and falls down when he is 78.4 m above the ground. He hears the sound of the helmet hitting the ground 4.23 seconds after it has slipped. Then find the speed of the sound in air.

What is the reason behind the generation of static electricity by rubbing comb on hair?

Three liquids with masses $m_1,m_2,m_3$ are thoroughly mixed. If their specific heats are $c_1,c_2,c_3$ and their temperatures are $T_1,T_2,T_3$ respectively, then the temperature of the mixture is:

In which of the following cases light bends towards the normal ray.

We do not feel uneasy even under the enormous pressure of atmosphere above as well as around us. Give a reason.

How do sound waves travel in air medium? Explain.

Calculate the speed of light in kilometres per hour.

Many times addition is multiplication, many times multiplication is power, then many times powers is???

The angle between an incident ray and the plane mirror is ${30}^{\circ }$. The total angle between the incident ray and the reflected ray will be:

(a) ${30}^{\circ }$

(b) ${60}^{\circ }$

(c) ${90}^{\circ }$

(d) ${120}^{\circ }$

What is cataract and how can it be corrected. Explain with a digram?

Which of the following is the symptom of cataract?

The appearance of moon changes from day to day. This is referred to as _____. It is caused by the_______ of the moon.

The image of an object placed on the principal axis of a concave mirror at a distance of $25cm$ from its pole, is formed on the object itself. Find out the linear magnification.

Friction between 2 objects is due to

A square frame of side L is dipped in a liquid. On taking out, a membrane is formed. If the surface tension of the liquid is T, the force acting on the frame will be

Given $K_1$ = 1500 N/m, $K_2$ = 500 N/m $m_1$ = 2 kg, $m_2$ = 1 kg, Find Potential energy stored in the springs in equilibrium.

Question 4 (a)
An archer stretches her bow while taking aim at the target. She then releases the arrow, which begins to move towards the target. Based on this information fill up the gaps in the following statements using the following terms:

muscular, contact, non-contact, gravity, friction, shape, attraction

(a) To stretch the bow, the archer applies a force that causes a change in its ___.

What is a rubber sucker ? How does it work ? State any one use of a rubber sucker.

Explain why, distilled water does not conduct electricity but tap water conducts some electricity.

Calculate the weight of a boy of mass 50 kg on Earth's surface. (Use g = 10 m/s²)

A glass rod rubbed with silk is suspended near an ebonite rod rubbed with fur. What will be your observation? Give a reason for your answer.

What action is being applied by the character while throwing the ball?