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