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class-4-Work, Force and Energy-1 1 / 20 Two girls playing table tennis. First girl hit the ball over the net and at a Point say 'T', the other girl hit it back with a lot of force. What would happen at point 'T'? 1) The force caused a change in the size of the ball. 2) The force caused a change in the direction of the ball. 3) The force caused the ball to stop moving 1 and 3 both 1 2 1 and 2 both 2 / 20 The works by using fuel derived from living and dead biological organisms. Wind Energy Biofuel Solar Energy Hydroelectric 3 / 20 Why we sprinkle talcum powder on a carom board? To reduce elastic force To reduce muscular energy To reduce frictional force To reduce gravitational force 4 / 20 Look at the lever below. Which object has the similar working principle as the above leves. C A B D 5 / 20 When we throw a ball into the air, it falls back. The force responsible for this is: Mechanical force Friction force Gravitational force Muscular force 6 / 20 What happens to the total energy of a moving object if all the applied forces are conserved? It decreases It remains constant The velocity is required to answer this question It increases 7 / 20 In which of the following situations no work is done ? A child slides down a playground slide You push on a heavy box but cannot move it You slam on the brakes and your car stops quickly A spaceship moves at constant velocity 8 / 20 The following is a diagram of a simple electromagnet. How could this electromagnet be made stronger ? Add more coils of wire to the nail Use a smaller battery Reverse the poles of the magnet Remove all the coils and the nail 9 / 20 Look at the following picture carefully. First identify the picture. The machine is a combination of two simple machines. Which simple machines combine to make it? Pulley and lever Lever and gears Wheel, axle and gears Gears 10 / 20 These products of nature are limited. Resources such as coal and oil are which means that when they are gone, nature cannot make them again. It is very important to limit their use and find other resources to replace them. Replaceable Nonrenewable Unlimited Usable 11 / 20 Rahul is applying force on a moving object in the same direction, the speed of the object: Remains the same Sometime decreases and sometime increases Decreases Increases 12 / 20 Air pressure is measured with a(n) Thermometer Psychrometer Barometer Anemometer 13 / 20 Electricity traveling through a wire is an example of Energy being transferred from place to place Energy flowing through the water cycle Earth's gravitational pull on an object A force applied by a simple machine 14 / 20 A ________ jet travels faster than sound. Aircraft Fighter planes All of the above Supersonic 15 / 20 If the resultant force acting on a body of constant mass is zero, the body's momentum is: Increasing Constant Decreasing Always zero 16 / 20 As defined in physics, work is done: When an object stops A and C both When an object moves When an object is stationary 17 / 20 Choose the wrong statement among followings Acoustics is the science and technology of energy The loudness of sound is measured in decibels (Db) Sounds vary in three ways : volume (loud or soft), pitch (high or low), and timbre (quality) All of the above statements are incorrect 18 / 20 In which of these activities, the sense of hearing is least important? B C D A 19 / 20 Mark the action in which work is being done: Carrying a rucksack to school A vehicle warming up its motor A computer running a program A man trying to open the door 20 / 20 While walking, some or all of the following types of energy and work are involved: Potential energy and the work done by the force that moves the body Kinetic energy, potential energy and work done by the body's weight Kinetic energy, potential energy, work done by forces excluding the body's weight and work lost through friction Mechanical and kinetic energies Your score isThe average score is 25% 0% Restart quiz
class-4-Work, Force and Energy-1
1 / 20
Two girls playing table tennis. First girl hit the ball over the net and at a Point say 'T', the other girl hit it back with a lot of force. What would happen at point 'T'?
1) The force caused a change in the size of the ball. 2) The force caused a change in the direction of the ball. 3) The force caused the ball to stop moving
2 / 20
The works by using fuel derived from living and dead biological organisms.
3 / 20
Why we sprinkle talcum powder on a carom board?
4 / 20
Look at the lever below.
Which object has the similar working principle as the above leves.
5 / 20
When we throw a ball into the air, it falls back. The force responsible for this is:
6 / 20
What happens to the total energy of a moving object if all the applied forces are conserved?
7 / 20
In which of the following situations no work is done ?
8 / 20
The following is a diagram of a simple electromagnet.
How could this electromagnet be made stronger ?
9 / 20
Look at the following picture carefully. First identify the picture. The machine is a combination of two simple machines. Which simple machines combine to make it?
10 / 20
These products of nature are limited. Resources such as coal and oil are which means that when they are gone, nature cannot make them again. It is very important to limit their use and find other resources to replace them.
11 / 20
Rahul is applying force on a moving object in the same direction, the speed of the object:
12 / 20
Air pressure is measured with a(n)
13 / 20
Electricity traveling through a wire is an example of
14 / 20
A ________ jet travels faster than sound.
15 / 20
If the resultant force acting on a body of constant mass is zero, the body's momentum is:
16 / 20
As defined in physics, work is done:
17 / 20
Choose the wrong statement among followings
18 / 20
In which of these activities, the sense of hearing is least important?
19 / 20
Mark the action in which work is being done:
20 / 20
While walking, some or all of the following types of energy and work are involved:
Your score is
The average score is 25%
Restart quiz
class-4-Work, Force and Energy -2 1 / 10 What is Nuclear Energy ? Energy that travels in waves Energy that is locked in the nucleus of an atom The kinetic energy of moving electrons Energy that is from solar panels 2 / 10 Which of the following is NOT an SI unit of measure ? Hertz Newton Watt Joule 3 / 10 The mechanical energy of a freely falling object is the difference Between its friction energy and its potential energy None of the above Between its potential energy and its gravitational energy Between its potential energy and its kinetic energy 4 / 10 A calorimeter is used for : Determine the heat of a reaction Determine the heat given off/absorbed during some process None of these Store the heat from a chemical reaction 5 / 10 Which of the following gadget is used to measure temperature? Scale Measuring jar Stop watch Thermometer 6 / 10 To measure the weight of milk, which of the following units can be used ? Seconds Millilitre Milligram Fahrenheit 7 / 10 The part of a nuclear power plant that prevents thermal pollution of lakes or rivers is the : Cooling tower Reactor Control rod Coolant/moderator 8 / 10 Blow at a plastic toy windmill and then hold it under a tap from which water is dripping. Which of the following, this activity is trying to show ? That wind and flowing water possess energy That tap and wind blown passess energy That moving air and moving water does not possess energy That only wind possesses energy 9 / 10 As you go up a mountain top, your weight : Decreases slightly Increases slightly Remains exactly the same Increases sharply 10 / 10 Which of these contain(s) an electromagnet ? Lamp Electric stove Compass Headphones Your score isThe average score is 35% 0% Restart quiz
class-4-Work, Force and Energy -2
1 / 10
What is Nuclear Energy ?
2 / 10
Which of the following is NOT an SI unit of measure ?
3 / 10
The mechanical energy of a freely falling object is the difference
4 / 10
A calorimeter is used for :
5 / 10
Which of the following gadget is used to measure temperature?
6 / 10
To measure the weight of milk, which of the following units can be used ?
7 / 10
The part of a nuclear power plant that prevents thermal pollution of lakes or rivers is the :
8 / 10
Blow at a plastic toy windmill and then hold it under a tap from which water is dripping. Which of the following, this activity is trying to show ?
9 / 10
As you go up a mountain top, your weight :
10 / 10
Which of these contain(s) an electromagnet ?
The average score is 35%
