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How to get to know whether a substance is positively charged or negatively charged after rubbing it ? Explain.

Iqbal has to push a lighter box and Seema has to push same heavier box. Who will have to apply larger force and why?

When a plastic pen is rubbed in dry hair, it attracts tiny pieces of paper. Which force is involved in this process?

Alex travels from his house to his friend's house with speed $V_1$ and returns to his house with speed $V_2$. The distance between the houses is $X$. What is the average speed of the Alex?

Earthquake shocks/waves come under _____.

Which of the following substances can perform as a lubricant?

Where does the solar system end?

Can we classify the force exerted by a charged body on another uncharged body as electrostatic force? Please explain

A ball thrown vertically upwards with a speed of 19.6 m/s from the top of a tower returns to the base of tower in 6s. Find the height of tower : ( Assume accelaration due to gravity $9.8m/s^2$)

Question 10
Explain why objects moving in fluids must have special shapes.

Which of the following force is/are contact force/(s)?

Why do like charges repel each other? Why do not they attract each other ?

If a body is pushed along a surface, it comes to rest after travelling some distance. The force which is responsible for stopping the motion of the body here is called ___

When an iron piece of irregular shape is immersed in a container containing water of $12ml$, the water rises to $30ml$, then the volume of the iron is .

Describe an experiment to show that the liquid pressure at a point increases with the increase in height of the liquid column above that point.

A light ray is incident perpendicular to the plane mirror. What is the angle of incidence and the angle of reflection respectively?

What happens to the needle of a compass kept nearby when electric current is switched on in a wire? Why does this happen?

If water is gradually heated from 0° C to 25° C. Which of the following statements would be correct?

Aquifer is the name given to the part of groundwater which-

If we keep an object between two parallel plane mirrors, the number of images form is

A stone of mass $2kg$ is thrown with a velocity of $20m{s}^{-1}$ across the frozen surface of a lake and comes to rest after travelling a distance of $100m$. Calculate the frictional force between the stone and the ice.

How will the magnitude of magnification change if an object placed at the center of curvature is moved away from the mirror?

A Kabaddi player is trying to increase his grip. He attempts to rub his hands with one of the following materials. Which one should he choose for a better grip?

How does electric discharge in lightning occur if air is a bad conductor of electricity?

A piece of wood is $3m$ long, $2m$ wide and has a thickness of $1m$. Find the density of wood if its mass is $2kg$.

Which of the following represents the units of current and potential difference respectively?

The wavelength of a sound in a medium is $50cm$. If wave velocity is $25m{s}^{-1}$, then what is the time period?

If a speaker produces a sound of speed 1220 m/s in water at a wavelength of 200 m, calculate its frequency.

Draw a ray diagram to show the formation of image of an object placed between the pole and focus of a concave mirror. State the position, size and nature of the image.

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:

Friction produces ______________.

A bird flying in the air experiences which type of pressure over its head?

When brakes are applied, from where does the extra friction come into play to stop the bicycle? [2 MARKS]

(ampere² ohm) is the unit of which physical quantity?

Light can be thought of as a type of:

What precautions would you take to protect yourself during an earthquake if you are inside the house ?

What will you observe when the metal top of an electroscope is touched with:

(a) a positively charged object?

(b) a negatively charged object?

Name the characteristic of sound which enables us to distinguish between a man's voice and a woman's voice even without seeing them.

An inflated balloon is rubbed with a woollen cloth and in another case, a ballpen refill is rubbed with polythene. When the balloon and refill are brought closer, it is observed that they attract each other. What can we understand by this?

Give any four sources of sound in a market place.

Find the effort needed to lift 20 Kg of load.