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Which of the following actions is in free fall?

1. An object dropped from a certain height.
2. An object is thrown upward or a person jumping off.
3. Flying in an aircraft.
4. A car accelerating at 9.8 m/s² on the road.

Which of the following is the ascending order of magnitude, for different kinds of friction?

A mosquito is making a sound with its wings at an average rate of 500 vibrations in 10 seconds. The frequency of vibrations is ___ Hz.

Explain why, sometimes when we take off the woollen sweater or a polyester shirt in a dark room, we can see tiny sparks of light and hear a crackling sound.

Explain the meaning of the statement 'Relative density of aluminium is 2.7'.

A piece of ice floating in a glass of water melts, the level of water in the glass

A block of mass $10kg$ is resting on a horizontal floor. What is the force applied by the floor on the block? (Acceleration due to gravity $g$ = $10m/s^2$)

Pole stars appears to be stationary because it is situated along the

What do you mean by the inter-molecular spaces? How do they vary in different states of matter?

Unit of capacitance is __.

Which of the following substances is generally added to common salt for edible purposes?

Give reason for the increase in rate of evaporation of a liquid when

(a) air is blown above the liquid

(b) surface area of liquid is increased

(c) temperature of liquid is increased.

Which fact about liquid pressure does the diagram in the figure illustrate?

The distance between a rarefaction and the next compression in a wave is $10cm$. The time period of the wave is $0.001s$. How much time will it take for the wave to travel a distance of $4km$?

A force causes a $10kg$ body to double it’s velocity in four seconds. If the final velocity of the body is $7.2m{s}^{-1}$, calculate the magnitude of the force.

Sportsman use shoes with spikes because it:

Which celestial objects are also called minor planets?

A system consists of two bodies with mass m₁ and m₂ where F is the gravitational force on m₂ due to m₁. A third body is kept next to m₂. Which expression will give the total force on m₁.

If the flow of charge is always in the same direction, then it is called ___ current.

In which of the following, the image of an object placed at infinity will be highly diminished and point sized?

In a circular motion, the direction of velocity at any point is:

A lens can be considered as a combination of different sections of

Which of the following space probes were launched to the study about the dwarf planet Pluto?

Code:

A lump of dough placed on a plate is pressed down with hands. This action of force alters

What is the characteristic behind the solubility of a substance in other substances?

A body initally travelling at $7m{s}^{-1}$, triples its speed. If the change in its momentum is $200kgm{s}^{-1}$, find the mass of the body.

If the melting point of a substance is ${10}^{\circ }C$, then its freezing point will be :

A sitar player plucks the wire of a sitar. After a short time each part of the wire starts vibrating in a directions perpendicular to the wire. The propagation of this disturbance is

A car is moving with a constant speed of $50km/hr$. Time taken $t$ to travel $200km$ is

What are the applications of Archimedes principle?

If a ray of light is incident at an angle of ${60}^{\circ }$ to the normal, then the angle formed by the reflected ray with the normal is equal to:

Metals can be moulded using heat. The stages that come in the process of moulding iron

The process of transferring charge from a charged body to the earth is called as ____.

What do you mean by the term dispersion ?

Why Cu, Al are used over tungsten, Fe to make fuses?

Which of the following can be electroplated with chromium ?
A. Bakelite
B. Graphite
C. Steel
D. Teflon

(a) A and B
(b) B and C
(c) only C
(d) B and D

If the electrons move from negative to positive terminal then why does current flows in the opposite direction

Activity to show that sounding tabla is vibrating

Two stones lying on the surface of the Earth have mass, a gravitational force will always exist between them and it will try to pull the stones towards each other. But actually, we don’t see the stones moving towards each other, why?

Statement 1: The acceleration because of gravitational force is in the range of ${10}^{-12}$$\frac{m}{s^2}$.

Statement 2: Stones are lying on a flat surface, so they cannot move.

Statement 3: The force of friction is much higher than the gravitational force.

Statement 4: The stones are irregular in shape, so they cannot move.

Which of the above statements explain the reason for the above question?