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class-4-Work, Force and Energy-1 1 / 20 Choose the wrong statement among followings 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) Acoustics is the science and technology of energy All of the above statements are incorrect 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 Add more coils of wire to the nail Reverse the poles of the magnet 3 / 20 Electricity traveling through a wire is an example of Earth's gravitational pull on an object Energy flowing through the water cycle Energy being transferred from place to place A force applied by a simple machine 4 / 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 5 / 20 Rahul is applying force on a moving object in the same direction, the speed of the object: Remains the same Decreases Sometime decreases and sometime increases Increases 6 / 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 7 / 20 The works by using fuel derived from living and dead biological organisms. Solar Energy Hydroelectric Wind Energy Biofuel 8 / 20 In which of these activities, the sense of hearing is least important? D C A B 9 / 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 10 / 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 3 both 1 and 2 both 11 / 20 As defined in physics, work is done: When an object stops When an object is stationary A and C both When an object moves 12 / 20 What happens to the total energy of a moving object if all the applied forces are conserved? The velocity is required to answer this question It remains constant It decreases It increases 13 / 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 Gears Wheel, axle and gears 14 / 20 Look at the lever below. Which object has the similar working principle as the above leves. B A D C 15 / 20 Why we sprinkle talcum powder on a carom board? To reduce gravitational force To reduce elastic force To reduce frictional force To reduce muscular energy 16 / 20 If the resultant force acting on a body of constant mass is zero, the body's momentum is: Constant Decreasing Increasing Always zero 17 / 20 A ________ jet travels faster than sound. Aircraft Fighter planes All of the above Supersonic 18 / 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 19 / 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 20 / 20 Air pressure is measured with a(n) Thermometer Barometer Anemometer Psychrometer Your score is The average score is 25% 0% Restart quiz
class-4-Work, Force and Energy-1
1 / 20
Choose the wrong statement among followings
2 / 20
The following is a diagram of a simple electromagnet.
How could this electromagnet be made stronger ?
3 / 20
Electricity traveling through a wire is an example of
4 / 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.
5 / 20
Rahul is applying force on a moving object in the same direction, the speed of the object:
6 / 20
When we throw a ball into the air, it falls back. The force responsible for this is:
7 / 20
The works by using fuel derived from living and dead biological organisms.
8 / 20
In which of these activities, the sense of hearing is least important?
9 / 20
Mark the action in which work is being done:
10 / 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
11 / 20
As defined in physics, work is done:
12 / 20
What happens to the total energy of a moving object if all the applied forces are conserved?
13 / 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?
14 / 20
Look at the lever below.
Which object has the similar working principle as the above leves.
15 / 20
Why we sprinkle talcum powder on a carom board?
16 / 20
If the resultant force acting on a body of constant mass is zero, the body's momentum is:
17 / 20
A ________ jet travels faster than sound.
18 / 20
In which of the following situations no work is done ?
19 / 20
While walking, some or all of the following types of energy and work are involved:
20 / 20
Air pressure is measured with a(n)
Your score is
The average score is 25%
Restart quiz
class-4-Work, Force and Energy -2 1 / 10 As you go up a mountain top, your weight : Increases slightly Increases sharply Remains exactly the same Decreases slightly 2 / 10 Which of the following is NOT an SI unit of measure ? Watt Newton Joule Hertz 3 / 10 Which of the following gadget is used to measure temperature? Measuring jar Stop watch Thermometer Scale 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 What is Nuclear Energy ? The kinetic energy of moving electrons Energy that travels in waves Energy that is locked in the nucleus of an atom Energy that is from solar panels 6 / 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 7 / 10 Which of these contain(s) an electromagnet ? Lamp Headphones Compass Electric stove 8 / 10 To measure the weight of milk, which of the following units can be used ? Fahrenheit Milligram Seconds Millilitre 9 / 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 10 / 10 The part of a nuclear power plant that prevents thermal pollution of lakes or rivers is the : Coolant/moderator Cooling tower Control rod Reactor Your score is The average score is 35% 0% Restart quiz
class-4-Work, Force and Energy -2
1 / 10
As you go up a mountain top, your weight :
2 / 10
Which of the following is NOT an SI unit of measure ?
3 / 10
Which of the following gadget is used to measure temperature?
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
What is Nuclear Energy ?
6 / 10
The mechanical energy of a freely falling object is the difference
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
A calorimeter is used for :
10 / 10
The part of a nuclear power plant that prevents thermal pollution of lakes or rivers is the :
The average score is 35%
