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Explain why in hot summer days water remains cool in earthen pots.

A block of mass $2.00kg$ moving at a speed of $10.0\frac{m}{s}$ accelerates at $3.00\frac{m}{s^2}$ for 5.00 s. Compute its final kinetic energy?

Two plane mirrors are set at right angles to each other. A coin is placed in-between these two plane mirrors. How many images of the coin will be seen?

The membrane-like structure in the ear through which we hear sound is:

(a) 1 kgf = ______ N (nearly)

(b) Moment of force = ______ $\times$ distance of force from the point of turning

(c) In a door, handle is provided ______ from the hinges.

(d) The unit of thrust is ______

(e) Thrust is the ______ force acting on a surface.

(f) Pressure is the thrust acting on a surface of ______ area.

(g) The unit of pressure is ______

(h) Pressure is reduced if ______ increases.

(i) Pressure in a liquid ______ with the depth.

(j) The atmospheric pressure on earth surface is nearly ______

A triangle with an area of $150c{m}^2$ has a base length of $50cm$. What is its height?

State the kind of mirror used

(a) by a dentist, and

(b) as a street light reflector.

A person travels from P to Q at a speed of 40 kmph and returns at a speed 50% more than the previous speed. What is the average speed of that person?

Where will the light rays meet?

Catterpillar tracks are used in battle tanks instead of tyres.why

What is the relation between wavelength and frequency?

The charge carried by an electron is:

(a) Give one example where force changes the speed of a moving object.

(b) Give one example where force changes the direction of a moving object.

Which of the options is the correct formula required to convert a quantity from Celsius to Kelvin?

A pressure of $2N/m^2$ is acting on a surface area of $6m^2$. What is the force acting on the surface?

There are 2 carry bags A & B. Bag A is provided with a broader strap while bag B is provided with a thinner strap. For the same load, Amar likes bag A as he is comfortable holding it on his shoulders, but with bag B he develops a pain on his shoulders. Choose the correct option

Simplify to get the answer as a simple rational number-

[ (-3/4)⁴ × (-3/4)² ] ÷ [ (3/4)² ] ³

How many images are formed when two mirrirs are placed at an angle of ${72}^{\circ }$?

Which of these is bio mass?

Which of the following substance will offer high resistance to electric current?

When light enters normally into turpentine oil from water, its speed ___ .

The force acting per unit surface area is called Pressure and its S.I. unit is _______.

A ring with radius $4m$ hinged at point P. Two forces $F_1$ and $F_2$ each of magnitude $10N$ act tangentially at the surface of the ring. Find the ratio of the torques produced by two forces $F_1$ to $F_2$ is

In a hydroelectric power plant, moving water is used for driving the wheels of a turbine to generate electricity. If the change in the kinetic energy of turbine is $3600J$ in two minutes, then the power generated will be:

The work done by the heart is $1J$ per beat. If it beats $72$ times in $1$ minute, then the power of heart is .

Identify the tube T in the given diagram.

How many modes of transfer of heat are there?

The area of a square is $16c{m}^2$. The area of the rectangle with length equal to double the side of the square and breadth equal to half of the side of the square is_____

On what factor does the pressure exerted by water at the bottom of container depends?

Equal masses of water and a liquid of density 2 $g/c{m}^3$ are mixed together, then the mixture has a density of $\frac{4}{n}$ $g/c{m}^3$ , where n is ___.

What is the centre of buoyancy? State its position for a floating body with respect to the centre of gravity of the body.

Which of the property makes difference between progressive and stationary waves

Calculate the pressure when a force of 200 N is exerted on an area of :(a) $10m^2$ (b) $5m^2$

An earthquake of magnitude 2 on Richter scale is:

(a) two times as strong as an earthquake of magnitude 1

(b) four times as strong as an earthquake of magnitude 1

(c) ten times as strong as an earthquake of magnitude 1

(d) hundred times as strong as an earthquake of magnitude 1

What is the shape of the gas in a cylindrical can of deodorant?