Recent questions tagged olympiad

Sound waves travel faster on a rainy day than on a dry day because

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Mechanical waves transfer

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Air friction ________ the velocity of the satellite.

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Moon travelers tie heavy weight at their back before landing on the moon because

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Read the passage below and answer the following question Take an empty plastic bottle. Close the mouth of the bottle with an airtight stopper. Put it in a bucket filled with water. We can see that the bottle floats. Push the bottle into the water. We can feel an upward push. If we try to push it further down, it will be difficult to push it deeper and deeper. Now release the bottle. It bounces back to the surface.The force due to the gravitational attraction of the earth acts on the bottle in the downward direction. So the bottle is pulled downwards. But the water exerts an upward force on the bottle. Thus the bottle is pushed upwards. Also the weight of an object is the force due to gravitational attraction of the earth. When the bottle is immersed, the upward force exerted by the bottle by the water on the bottle is greater than its weight. Therefore it rises up when released. To keep the bottle completely immersed the upward force on the bottle due to water should be balanced. This can be achieved by an externally applied force acting downwards. This force must be at least equal to the difference between the upward force and the weight of the bottle. QUESTION : If the upward force exerted by the liquid is equal to the downward force due to the weight of the object then the object will

asked Oct 29, 2017 by priyanka.c

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Read the passage below and answer the following question Take an empty plastic bottle. Close the mouth of the bottle with an airtight stopper. Put it in a bucket filled with water. We can see that the bottle floats. Push the bottle into the water. We can feel an upward push. If we try to push it further down, it will be difficult to push it deeper and deeper. Now release the bottle. It bounces back to the surface.The force due to the gravitational attraction of the earth acts on the bottle in the downward direction. So the bottle is pulled downwards. But the water exerts an upward force on the bottle. Thus the bottle is pushed upwards. Also the weight of an object is the force due to gravitational attraction of the earth. When the bottle is immersed, the upward force exerted by the bottle by the water on the bottle is greater than its weight. Therefore it rises up when released. To keep the bottle completely immersed the upward force on the bottle due to water should be balanced. This can be achieved by an externally applied force acting downwards. This force must be at least equal to the difference between the upward force and the weight of the bottle. QUESTION : Which of the statement is not true? 1. An object floats if its density is lesser than that of the liquid in which it is immersed 2. The density of a substance is mass per unit area 3. The weight of an object is due to the gravitational pull on it 4. The downward force exerted by the liquid is called buoyancy

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A truck and a car are moving with the same kinetic energy are stopped by applying brakes. Which will stop at a smaller distance?

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What will happen to the kinetic energy of the particle, if its momentum is doubled?

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Sand is spread on tracks covered with snow. Why?

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A balloon has a mass of 10g in air. The air escapes from it at an uniform rate with a velocity of 5cm/s and the balloon shrinks completely in 2.5 s. What is the average force acting on the balloon.

asked Oct 29, 2017 by priyanka.c

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A thief jumps from the roof of a house with a box of weight W on his head. What will be the weight of the box as experienced by the thief during the jump?

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The following figure shows the time-acceleration graph for a particle in rectilinear motion. What will be the average acceleration in first twenty seconds?

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A particle moves along a circle of radius R. It starts from a point and moves in an anticlockwise direction. What will be the displacement made by it along the diameter?

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When will the average velocity be equal to the instantaneous velocity?

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The difference between pulse and wave is

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The ceilings of concert halls are generally curved because

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A person clapped his hands near a cliff and heard the echo after 3s. If the speed of sound is 330m/s, find the distance of the cliff from the person.

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The types of waves produced by a slinky is

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Read the following passage and answer the question given below The word energy is often used in our daily life, but in science we give it a precise meaning. Let us consider the following examples : when a fast moving cricket ball hits a stationary wicket, the wicket is thrown away. Similarly, an object when raised to a height gets the capability to do work. You must have seen that when a raised hammer falls on a nail placed on a piece of wood, it drives the nail into the wood. We have also observed children winding a toy and when the toy is placed on the floor it starts moving. When a balloon is filled with air and when we press it we notice a change in shape. As long as we press it gently, it can come back to its original shape when the force is withdrawn. However if we press the balloon hard it might explode. In all these cases the object acquire through different means the capability of doing work.An object having the capability to do work is said to posses energy. The object which does work losses energy and the object on which work is done gains energy. QUESTION : The energy possessed by the toy when it moves on the floor is

asked Oct 29, 2017 by priyanka.c

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Read the following passage and answer the question given below The word energy is often used in our daily life, but in science we give it a precise meaning. Let us consider the following examples : when a fast moving cricket ball hits a stationary wicket, the wicket is thrown away. Similarly, an object when raised to a height gets the capability to do work. You must have seen that when a raised hammer falls on a nail placed on a piece of wood, it drives the nail into the wood. We have also observed children winding a toy and when the toy is placed on the floor it starts moving. When a balloon is filled with air and when we press it we notice a change in shape. As long as we press it gently, it can come back to its original shape when the force is withdrawn. However if we press the balloon hard it might exploded. In all these cases the object acquire through different means the capability of doing work. An object having the capability to do work is said to possess energy. The object which does work loses energy and the object on which work is done gains energy. QUESTION : Work done on an object is

asked Oct 29, 2017 by priyanka.c

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A stone thrown up vertically returns to the thrower after 5s, then the maximum height reached by it is

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What happens to the gravitational force if the distance between objects is tripled?

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Two balls have masses m and (1/2)m and velocity v and (1/2) v respectively. The ratio of their momentum is

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When a tree is shaken, its leaves and fruits fall down, this is because of

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The agent which causes the change in speed of a freely falling object is

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Which of the following statements are not correct? 1. If the speed-time graph is a straight line parallel to time axis, then it indicates that the object is moving with uniform speed 2. The area below the velocity-time graph gives the distance covered by the object. 3. Acceleration is taken as positive if it is in the direction opposite to the direction of velocity. 4. The velocity-time graph for non-uniformly accelerated motion is always a straight line.

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If the weight of a body is 20gwt as measured by a spring balance, then its mass is

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Pascal is unit for

asked Oct 28, 2017 by priyanka.c

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If the velocity-timegraph is a line parallel to time axis, then what be its acceleration

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Choose the correct answer

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In how much time does the light of sun reaches the planet earth?

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Choose the renewable sources from the following

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From the following family tree name the missing box

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Which among the following is used for transporting heavier goods for example sack of grains, boxes of blankets, etc.

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They are not closely packed. They do not have any shape. They are also called fluids. They are less rigid. What are they?

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What is the wavelength of sound and light waves?

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Why can we see moon and the star only during the night time?

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Name 1 and 2 in the following figure

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Which of the following type of cloth is used in spring season?

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How many important systems are there in a human body?

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How much percentage of ocean contains fresh water?

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What happens if you lack sunlight?

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What are the things does a first aid box have?

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When an adult human rests,how much volume of air is inhaled or exhaled

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What is good for digestion after eating?

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How old is solar system approximately ?

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Which satellite system helps to connect remote region, vehicles, ships, people and aircraft to other parts of the world and/or other mobile or stationary communications units, in addition to serving as navigation systems.

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Humus has a characteristic black or dark brown colour and is organic due to an accumulation of organic

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What is the disease caused by eating Stale food from the following?

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The movement of air between the environment and the lungs via inhalation and exhalation is called

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