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Which material lose electrons when 2 material ( insulators) are rubbed together to form electrostatic force?

If net displacement of any particle, moving in a 1-dimension is zero then its average speed?

What is the order of rotational symmetry of this star?

The same force F acts on four different objects having the areas given below, one by one. In which case the pressure exerted will be the maximum?
(a) $20m^2$ (b) $50m^2$ (c)$10m^2$ (d) $100m^2$

Name the substance whose weight produces atmospheric pressure.

Which of the following represent the unit of pressure and thrust respectively?

How do jewellers make less expensive metal ornaments look more expensive?

Motion of planets around sun is an example of ____.

The light ray parallel to principal axis of a convex mirror will:-

Can we hear sound waves having frequency hundred thousands Hz

Which of the following is true about the pitch of a male and a female voice?

What is the value of m in the following equation?

$3m+20=5m+2$

In a bucket full of water, a block weighing $50N$ was immersed. Water weighing $5N$ spilled out of the bucket. Calculate the buoyant force.

A body of dimensions 2m $\times$ 3m $\times$ 4m is acted upon by a force of 50N on the top surface (2m $\times$ 3m). Calculate the pressure due to the force on that surface.

What kind of friction is experienced by a dolphin swimming through the ocean ?

an elastic band can store energy

<a> explain how the elastic band can be made to store energy

(b) how can its energy be released

What are inner planets and outer planets? Name them.

What do you mean by " Friction opposes relative motion "?

Pressure at the bottom of the water filled container is more if

How old is the Moon?

The total number of images(n) formed by 2 plane mirrors placed at an angle of $\theta$ is ___, where $\theta$ is the angle between two mirrors.

Which of the following is a way to increase friction between two surfaces?

In humans, which organ produces sound?

A concave mirror gives a virtual and enlarged image of the object. What is the position of the object?

If the angle of incidence + angle of reflection = 60° then what will be the angle of incidence?

static friction is than sliding friction

Why is rolling friction less than sliding friction?

When a car moves on a banked road, the centripetal force is due to

In a stack, there are 10 books each of thickness 50 mm and 15 paper sheets each of thickness 0.012 mm. What is the total thickness of the stack? Express the final thickness of stack in cm. [3 MARKS]

Calculate the volume of a book which is 25 cm in length, 12 cm in breadth and 2 cm in height.

What is the maximum audible frequency for human beings under the age of 5?

In a dark room a parallel beam of light falls on a white wall and the reflected light can be seen from anywhere because :

Two identical rods of copper is heated to different temperatures - one by $5^{\circ }C$ and the other by ${10}^{\circ }C$. Which rod will expand more?

Consider isotherms I, II and III in the figure.

Select the correct statement.

The pressure of a vertical column of mercury is less than that of water at the same height. Do you agree? Why or why not?

A wire stretched between two fixed supports, is plucked exactly in the middle and then released. It executes(neglect the resistance of the medium).

A column of air extending up to the height of atmosphere and base of area $10cm\times 10cm$ is acting on a boy's head. Why didn't he get crushed?