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