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In the game of tug-of-war, the rope will _________ if the two teams pull at it with equal force.

Why are light waves able to travel in the vacuum not sound waves ?

Arul's weight is 4 times the weight of Arav. Find Arav's weight if the sum of their weights is 50 kg.

What type of materials allows electricity to flow freely?

A ray of light is incident on a medium at $\angle 60°$. The angle of refraction is different for different media for an angle of incidence = 60°.

In which medium the speed of light is slowest?

Fig.8.37 below shows a metal rod AB placed on an insulating stand. In Fig. (a), a negatively charged ebonite rod C is touched with the metal rod AB, while in Fig.(b), the negatively charged ebonite rod C is held near the rod AB. State the kind of charges at the ends A and B of the rod, in each case.

Which cube will experience more pressure?

The mass of an empty density bottle is 21.8 when filled completely with water it is 41.8 g and when filled completely with liquid it 40.6 g . Find :

(a) the volume of density bottle.

(b)the relative density of liquid.

Which among the following places is the best place to stay during a thunderstorm?

A gun of mass M fires a bullet of mass m with a horizontal speed V. The gun is fitted with a concave mirror of focal length f facing towards the receding bullet. Find the speed of separation of the bullet and the image just after the gun was fired.

How do we calculate the number of images formed by a pair of plane mirrors?

What will be the number of images if not calculated as a fraction?

Calculate the number of images formed if the angle between the mirrors is 1) 50° 2) 72°.

When you punch holes in a bottle filled with water , it starts leaking but once you cap it ,it stops leaking. Why is that?

Why is moon a satellite of Earth but Earth not a satellite of Sun.

Which of the following should be used to reduce friction on a carrom board?

In the given figure, when light emerges from the glass slab, the light ray bends:

The body immersed in a liquid experiences a net upward force when the weight of the body is___ than/to the buoyant force.

A 1,000 kg car moving at a speed of 20 ms^–1 is brought to rest at a distance of 50 m, calculate the net force acting on the car.

An arrow fired vertically from a bow attains a maximum height of 5 m from the level it is released. If the mass of the arrow is 500 grams, work done by the bow on the arrow is greater than which of the following? (Assume, g = 10 m/s²)

A block needs 50 N of force to move it and you are applying 5 N of force on that block in the horizontal direction. So how much frictional force will the surface be applying on the block?

How is pitch related to frequency ?

A block of mass 2 kg and dimensions 2 cm x 4 cm X 1 cm is kept on a table find the force applied by the block and also find the pressure applied by the surface whose area is 2 cm x 4 cm

Why does a plastic comb rubbed with dry hair attract tiny pieces of paper?

Why does the moon have different shapes on different nights?

In the ball and ring experiment, if the ball after heating is left to cool on the ring for some time, the ball again passes through the ring. Explain the reason.

When we are under swimming pool and tried to clap our hands under the water it requires a lot of force. Why is it so?

A car takes 4hrs to travel from Bangalore to Chennai whereas the flight takes only 30min to travel from Bangalore to Chennai. If the distance from Bangalore to Chennai by road is 400km and the air is 150km.

Answer in the given order (in $\frac{km}{hr}$ ):

Find the Average Speed of Flight, Average velocity of Flight, Average speed of car, Average velocity of car.

The motion of a freely falling body is an example of:

In a particular type of 15 kg of alloy the ratio of iron to carbon is 2:3. Now 3kg of iron is added to the mixture.
Choose the correct options below:

A rope of length 5m and mass 5kg is kept on frictionless surface and a force of 5N is applied to one of its end. Find tension in the rope at 1m from this end.

Sound produced by pouring of water into a vessel is due to:

Do other stars revolve around the Sun?

How do the density of a body and that of a liquid determine whether the body will float or sink into that liquid?

The electric nature of lightning was established by a scientist named :

(a) Isaac Newton (b) Robert Hooke (c) Benjamin Franklin (d) Thales

Which of the following is an example of conversion of mechanical energy to electrical energy ?

Why does hair of the hand raise when the hand is brought near to the television screen once the T.V is switched off ?

Starting from rest, Saurabh peddles his bicycle to attain a velocity of $6m{s}^{-1}$ in $30s$. Then, he applies brakes so that the velocity of the bicycle comes down to $4m{s}^{-1}$ in the next $5s$. The acceleration of the bicycle in both the cases are _____ and _____ respectively.

Find the area of a rectangle of length $4cm$ and breadth $6cm$

1 :-Give the difference between distance and displacement ?

2 :- Give the difference between speed and velocity ?

A boy exerts a pressure of 48 PA on a box by putting a force of 64N .Calculate the area over which the force is applied .Full explaination

Name a device which glows even when a weak electric current passes through it.

Why is gold used as leaf electroscope?

In which of the following materials a magnet is generally used?