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The interaction between the Earth and the Moon, which keeps the Moon revolving around the Earth is a _______ force.

Cooking utensils are made from:

A) good conductors of heat

B) bad conductors of heat

C) insulators

D) both good conductors and bad conductors of heat

Why do we call some nearby planets, like Venus to be a non-luminous body, although light comes out from those planets?

The edge of the circular table cover is of diameter 1.5 m. Find the length of the lace required and also find its cost if one metre of the lace costs RS 15.

What will happen to the height of the mercury column if we take a Barometer inside a deep pit/trench?

A train travels 40 km at a uniform speed of $30km{h}^{-1}$. Its average speed after travelling another 40 km is $45km{h}^{-1}$ for the whole journey. Its speed in the second half of the journey is:

Molality of a solution in which 0.13 mole of solute is dissolved in 500 gm of water.

Match the following:
$\begin{array}{cc}\text{Column I}& \text{Column II}\\ 1.\text{Soldiers in a march past}& A)\text{Periodic Motion}\\ 2.\text{A mark made on the blade of a rotating fan after switching off}& B)\text{Circular Motion}\\ 3.\text{Motion of a swing}& C)\text{Rectilinear Motion}\end{array}$

Select the appropriate option.

Why do hot air goes up and cool air comes down explain it with video

Fig. 7.20 shows two jars A and B containing water up to different heights. Which will produce sound of higher pitch when air is blown on them ?

A satellite is revolving around the Earth in a well defined circular orbit, the gravitational force between the Earth and satellite is the centripetal force of the circular motion. What can we say about the motion of the satellite if the gravitational force becomes zero?

Information can be transmitted by a particle when:

___ material allows light to pass partially through it.

Prove that high speed winds reduce air pressure.

An object moves such that it maintains constant distance from a given point. This motion of the object can be:

The size of the shadow:

Which of the following were not used in India in ancient times?

A tsunami is caused due to

Black color is a good absorber of:

Which of these products is equal to 1?

The curved shining outer surface of a spoon acts as a _______ mirror.

If the mass of a body is 5kg, its weight on the surface of the earth would be ___ N. (g = 9.8 $m/s^2$)

For all positions of an object before a convex mirror, the image formed is on _______ side of the mirror.

Lightning is an example of___.

The maximum energy in the thermal radiation from a hot source occurs at a wavelength of $11\times {10}^{-5}cm$. According to Wein's law, the temperature of the source (on Kelvin scale) will be n times the temperature of another source(on Kelvin scale) for which the wavelength at maximum energy is $5.5\times {10}^{-5}cm$. The value n is

Which among the following will make the sharpest cut on application of same amount of force?

An incandescent bulb connected to a cell does not glow in a circuit. Which of the following can be the reason/s?

Why is soft iron used as the core of the electromagnet in an electric bell?

What type of material allows electrons to flow freely?

What is the exact meaning of periodic motion and give examples

Question 15

A flag mounted on a flag post near the sea coast flutters in the direction of sea. During what time of the day does this happen? (Daytime or Night time)

Sir/Ma'am

Can we measure the temperature of solids using a laboratory thermometer? If not then which thermometer is used to measure the temperature of solids?

Among the following situations, which will have more than one shadow of an object at a time?

There are two boxes A & B. Cell phones are kept in both the boxes, all air is sucked from box A and then closed by a device. While box B is simply closed by a device without sucking air from it. A call is made simultaneously on both the phones, but sound comes only from box B. This is because

Statement 1:In box B there are air particles to vibrate but in box A there is vacuum.

Statement 2 : Sound needs a medium for propagation.

Which part of speech is the underlined word?

The dog barks loudly at strangers.