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The atmosphere is held to the Earth by the force of

An object is said to have a uniform motion if it moves

Rahul measures his height and expresses it in terms of a fundamental unit of the FPS system of measurement. What do you think is the symbol of the unit he used?

A force produces an acceleration of 5.0 cm/s^2 when it acts on a body of mass 20 g. The force in newton is:

Which particle flows to produce electric current in a metal wire?

Name a device which is used to produce changing patterns or sequences by means of multiple reflections.

What is density?

What are the Do's and Don'ts to be followed during a thunderstorm when a person is outside the house?

For which of the following, the centre of gravity can exist outside the body?

If a metallic sphere gets cooled from ${62}^{\circ }C$ to ${50}^{\circ }C$ in 10 minutes and in the next 10 minutes gets cooled to ${42}^{\circ }C$, then the temperature of the surroundings is

A mirror can form both real and virtual images. The mirror is likely to be a _________ mirror.

In a hydroelectric-power plant:

Matt has a freely suspended magnet which is pointing in the North-South direction. He brings a large magnet which is not pointing in the North-South direction close to it. Can you tell what will happen to the first magnet?

Electrical energy is converted into light energy in _________.

A metal bar of length L and area of cross-section A is rigidly clamped between two walls. The Young's modulus of its material is Y and the coefficient of linear expansion is $\alpha$. The bar is heated so that its temperature increases by ${\theta }^{\circ }C$. The force exerted at the ends of the bar is given by

What are the type of sound waves

A geostationary satellite orbits around the earth in a circular orbit of radius 36,000 km. Then, the time period of a spy satellite orbiting a few hundred km above the earth's surface ($R_e$ = 6400 km) will approximately be

Why a thermometer is kept only below our tongue, underarm or ear

An object travels at $50m{s}^{-1}$ for the first 2 seconds and travels at $70m{s}^{-1}$ for the next 2 seconds. What is its average speed for the first 4 seconds?

Two magnets are placed close to each other as shown below. Which set will attract each other?

What is the intensity of sound wave?

Convert ${32}^{\circ }C$ to Fahrenheit scale.

Select the most appropriate option:

Statement 1: During a short circuit, two wires come in contact without the presence of resistance in between and a large amount of current flows through the circuit.

Statement 2: In case of overloading many devices are connected to the same circuit and hence a low current flows through the circuit.

Which of the following statement(s) is/are correct according to the laws of reflection?

A cyclone is also called as ____________in Philippines and Japan.

We are able to see only one side of the moon. Why? [3 MARKS]

A car move goes from A to B in 4 hours at an average speed of 40 miles per hour. At t=1 hour, its speed would be:

1. 36

Jagdish jogs for 10 minutes every day in the morning. He travels a distance of 3 km. His speed in m/s is

Question 8
Which of the following relations is correct?

1. Speed = $Distance\ast Time$
2. Speed= $\frac{Distance}{Time}$
3. Speed= $\frac{Time}{Distance}$
4. Speed = $\frac{1}{Speed\ast Time}$

A light-ray can be thought to behave as______to explain the various phenomena such as reflection, interference etc.

Pick the gadget(s) that have electric switches built in them.

Which of the following is true regarding a transverse wave?

Area of a rectangle having length $10cm$ and breadth $50mm$ respectively will be :

A bullet fired from a gun has a mass $100g$ and velocity $1000km/hr$. What is its kinetic energy?

Choose the nearset value.

Among the products of combustion of coal and petroleum, which oxide is not poisonous?

Rahul has started a new shop where he sells food packed in iron containers. But he is receiving a lot of complaints about the spoilage of food. He tells his friend Rohit about this problem. Rohit suggests him to use tin coated iron instead. What could be the reason for this?

Thunder: Rain: : ? : Night

When we press the bulb of a dropper with its nozzle kept in water, the air in the dropper escapes in the form of bubbles. Once we release the pressure on the bulb, water gets filled in the dropper. The rise of water in the dropper is driven by -

It is given that both liquid A and liquid B exert the same amount of pressure. The density of liquid A is twice the density of liquid B. The height of the column of liquid B is 10 cm. Then what would be the height of the column of liquid A?(Use the formula for Pressure(P) as P = $\rho gh$; ${}^{\prime }{\rho }^{\prime }$ is the density of the liquid, 'g' -acceleration due to gravity, 'h'- height of the liquid column)

An aeroplane is flying at a speed of 120m/s. A boy watches the plane move from that instant when it was above his head to an instant after 6 seconds from initial instant. The angle of inclination after 6 seconds is ${30}^{\circ }$. Which of the following is/are correct?

___ is the only natural magnet.

Which of the given are physical quantities?