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