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