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Recent questions tagged class 9

Filtration is a method of separation of mixtures that are

asked Apr 12, 2018 by meena.p

1 answer

The rate of change of position of an object with time in a given direction is called

asked Nov 3, 2017 by priyanka.c

1 answer

A greater effort is required to stop a bullet from the gun than to stop a bullet of same mass which is thrown by the hand. This is due to

asked Nov 3, 2017 by priyanka.c

1 answer

The law of inertia was formulated by

asked Nov 3, 2017 by priyanka.c

1 answer

When a bus takes a sharp turn a person sitting in the bus experiences a force acting away from the centre of the curved path. This is due to

asked Nov 3, 2017 by priyanka.c

0 answers

Read the passage and answer the question below <br><br> Different objects may take different amounts of time to cover a given distance. Some of them move fast and some move slowly. The rate at which objects move can be different. Also, different objects can move at the same rate. One of the ways of measuring the rate of motion of an object is to find out the distance travelled by the object in unit time. This quantity is referred to as speed. The SI unit of speed is ms-1. To specify the speed of an object we require only its magnitude. The speed of an object need not be a constant. In most cases, objects will be in non-uniform motion. Therefore we describe the rate of motion of such objects in terms of their average speed. The average speed of an object is the total distance divided by the total time taken. If the speed of the object is v, then v = s/t, where s I the distance travelled and t is the time taken. <br><br> QUESTION : When an object covers unequal distances in equal intervals of time then it is said to be

asked Nov 3, 2017 by priyanka.c

1 answer

Read the following passage and answer the question below <br><br> Different objects may take different amounts of time to cover a given distance. Some of them move fast and some move slowly. The rate at which objects move can be different. Also, different objects can move at the same rate. One of the ways of measuring the rate of motion of an object is to find out the distance travelled by the object in unit time. This quantity is referred to as speed. The SI unit of speed is ms-1. To specify the speed of an object we require only its magnitude. The speed of an object need not be a constant. In most cases, objects will be in non-uniform motion. Therefore we describe the rate of motion of such objects in terms of their average speed. The average speed of an object is the total distance divided by the total time taken. If the speed of the object is v, then v = s/t, where s I the distance travelled and t is the time taken. <br><br> QUESTION : An object travels from A to B at 40 m/s and from B to A at 60m/s. Then its average speed is

asked Nov 3, 2017 by priyanka.c

1 answer

If the radius of the earth becomes twice its original radius without change in its mass, what will happen to your weight?

asked Nov 3, 2017 by priyanka.c

1 answer

An astronaut tries to drop an object from a height of 10 m on the surface of the moon. How long will it take to reach the moon's surface? [take g= $10m/s^2$]

asked Nov 3, 2017 by priyanka.c

1 answer

The value of g is

asked Nov 2, 2017 by priyanka.c

1 answer

The kinetic energy of a ball of mass 1kg moving at a speed of 20 cm/s is

asked Nov 2, 2017 by priyanka.c

1 answer

What will be the time taken to do 1320 J of work at the rate of 110W?

asked Nov 2, 2017 by priyanka.c

1 answer

The sensory cells of cochlea are called

asked Nov 2, 2017 by priyanka.c

1 answer

The term that describes how the brain interprets the frequency of sound is called

asked Nov 2, 2017 by priyanka.c

1 answer

The frequency of a sound wave has 1000 Hz and a wavelength of 34 cm. How long will it take to travel 1 km?

asked Nov 2, 2017 by priyanka.c

1 answer

The property of sound which is used in stethoscope is

asked Nov 2, 2017 by priyanka.c

1 answer

The wavelength of a sound wave whose frequency is 300 Hz and speed 330 m/s is

asked Nov 2, 2017 by priyanka.c

1 answer

When we increase the loudness of sound produced by a radio, the property of the sound wave that changes is

asked Nov 2, 2017 by priyanka.c

1 answer

Ultrasonic waves are used for detecting objects under water. What technique is used for this ?

asked Nov 2, 2017 by priyanka.c

1 answer

In which of the following cases is the potential energy of the spring minimum?

asked Nov 2, 2017 by priyanka.c

1 answer

The work done by the weight of a 1.5 kg mass when it moves through a distance of 2m is

asked Nov 2, 2017 by priyanka.c

1 answer

Read the passage below and answer the question <br><br> If the displacement of an object is perpendicular to the force acting on it, the work done by the force on the object is zero. Consider for example, the force of gravity acting on an aero plane flying in the sky. The force of gravity is in the downward direction, whereas the aero plane's displacement is in the horizontal direction, I.e; the force and the displacement are perpendicular to each other. There is no displacement in the direction of the force of gravity, and therefore, the work done by it on the aero plane is zero.<br><br> QUESTION : When the porter climbs up a staircase the work done is

asked Nov 2, 2017 by priyanka.c

1 answer

Read the passage carefully and answer question <br><br> If the displacement of an object is perpendicular to the force acting on it, the work done by the force on the object is zero. Consider for example, the force of gravity acting on an aero plane flying <br><br> in the sky. The force of gravity is in the downward direction, whereas the aero plane's displacement is in the horizontal direction, I.e; the force and the displacement are perpendicular to each other. There is no displacement in the direction of the force of gravity, and therefore, the work done by it on the aero plane is zero.<br><br> QUESTION : A porter is moving a distance of 'd' m, with a heavy load on his head. The work done by this porter is

asked Nov 2, 2017 by priyanka.c

1 answer

Density of gold is $19300 kg/m^3$. Then its relative density is

asked Nov 2, 2017 by priyanka.c

1 answer

An object which has a mass of 15 kg is taken to the moon. What will be its mass there?

asked Nov 2, 2017 by priyanka.c

1 answer

The velocity of a ball, which is projected with an initial velocity u, to a height h, its maximum height is

asked Nov 2, 2017 by priyanka.c

1 answer

The momentum of an object whose mass is 10 kg and velocity 15 m/s is

asked Nov 2, 2017 by priyanka.c

1 answer

The slope of displacement graph indicates

asked Nov 2, 2017 by priyanka.c

1 answer

A train starts from station A and attains a velocity of 30m/s in one minute. Then its acceleration is

asked Nov 2, 2017 by priyanka.c

1 answer

If a particle covers equal distances in equal intervals of time, it is said to be

asked Nov 2, 2017 by priyanka.c

1 answer

Which line of the graph represents the greatest speed?

asked Nov 1, 2017 by priyanka.c

1 answer

Bats catch the prey by using the technique of

asked Nov 1, 2017 by priyanka.c

1 answer

Read the passage below and answer the question <br><br> Sound waves are longitudinal waves, which means they vibrate in the same direction as the direction of travel. Sound waves can only travel through solids, liquids or gases. A good model of sound waves is a spring. The section of waves when they are pushed together are areas of compressions and when the particles are far apart the areas are called rarefactions. Sound waves can be reflected, refracted and diffracted. <br><br> The hearing range of Human ear is 20Hz to 20KHz. Sounds with frequencies below 20Hz are called Infrasound and sound waves with frequencies above 20KHz are called Ultra sound. These waves have a wide applications in various fields like industry, medicine, agriculture etc; Speed of the sound can be calculated by the equation speed of sound = distance / time. <br><br> QUESTION : Similarities between light and sound waves are

asked Nov 1, 2017 by priyanka.c

1 answer

Read the passage below and answer the question <br><br> Sound waves are longitudinal waves, which means they vibrate in the same direction as the direction of travel. Sound waves can only travel through solids, liquids or gases. A good model of sound waves is a spring. The section of waves when they are pushed together are areas of compressions and when the particles are far apart the areas are called rarefactions. Sound waves can be reflected, refracted and diffracted.<br><br> The hearing range of Human ear is 20Hz to 20KHz. Sounds with frequencies below 20Hz are called Infrasound and sound waves with frequencies above 20KHz are called Ultra sound. These waves have a wide applications in various fields like industry, medicine, agriculture etc; Speed of the sound can be calculated by the equation speed of sound = distance / time. <br><br> QUESTION : Sound waves are longitudinal waves because

asked Nov 1, 2017 by priyanka.c

1 answer

Sound waves travel fastest through

asked Nov 1, 2017 by priyanka.c

1 answer

How much energy is transferred by a 50W lamp in 5 s?

asked Nov 1, 2017 by priyanka.c

1 answer

What is the gravitational field strength of the Moon?

asked Nov 1, 2017 by priyanka.c

1 answer

What is the momentum of a 50 kg object moving at 30 km/hr?

asked Nov 1, 2017 by priyanka.c

1 answer

Which of the following is not a safety feature of a car to absorb momentum

asked Nov 1, 2017 by priyanka.c

1 answer

A 50kg object is moving with a speed of 20m/s. How much force is needed to stop it in 5s?

asked Nov 1, 2017 by priyanka.c

1 answer

Which of the statements is not true? <br> 1. when a car moves along the road with a constant speed, the net force acting on the car is zero <br> 2. linear momentum is the product of mass and acceleration <br> 3. A body at rest continues to be at rest and a body in uniform motion continues to move <br> 4. The flight of rockets is in accordance with Newton's third law of motion

asked Nov 1, 2017 by priyanka.c

1 answer

What will happen to a car, if its resultant force is acting along the direction of its motion?

asked Nov 1, 2017 by priyanka.c

1 answer

The resultant force is a force

asked Nov 1, 2017 by priyanka.c

1 answer

Newton's first law states

asked Oct 31, 2017 by priyanka.c

1 answer

What does the horizontal line in a distance-time graph represent?

asked Oct 31, 2017 by priyanka.c

1 answer

A car travels 100 m in 5 minutes. What is its average speed?

asked Oct 31, 2017 by priyanka.c

1 answer

Velocity of sound is independent of

asked Oct 31, 2017 by priyanka.c

1 answer

The velocity of sound in dry air is

asked Oct 31, 2017 by priyanka.c

0 answers

On driving a scooter for a long time, the air pressure in the tyres slightly increases

asked Oct 31, 2017 by priyanka.c

1 answer

Cloudy nights are warmer than clear ones because

asked Oct 31, 2017 by priyanka.c

1 answer

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