Unit – VI WORK,POWER AND ENERGY - PHYSICS
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Question 1 |
Work done by the force is said to be negative, if the displacement of a body is ………….
Along the force | |
against the force |
Question 2 |
Pick the odd once out from the following based on the nature of energy possessed by them.
moving car | |
water stored in a tank | |
a book on a table | |
ceiling fan in off position |
Question 3 |
Commercial unit of electrical energy is …………..
joule | |
joule/second | |
watt | |
kilowatt hour |
Question 4 |
The SI unit of work is ……………..
watt | |
joule |
Question 5 |
Capacity of doing work is called …………….
power | |
energy |
Question 6 |
Work done = power x …………….
time taken | |
displacement |
Question 7 |
The SI unit of work is ………………
joule | |
watt | |
newton | |
killogram |
Question 8 |
Energy possessed by an object due to its motion is called
potential energy | |
gravitational potential energy | |
conventional energy | |
kinetic energy |
Question 9 |
An example for potential energy
an apple falling | |
moving water | |
compressed spring | |
rotating mixie |
Question 10 |
An example for kinetic energy
an apple falling | |
a book lying on the table | |
water stored in a reservoir | |
a ball at rest |
Question 11 |
The init of power is ……………..
joule | |
watt |
Question 12 |
Electricity can produce ………… when passed through a resistance.
heat | |
light |
Question 13 |
One kilowatt – hour = ……………
3600000 J | |
1000 J |
Question 14 |
Electric energy is converted into mechanical energy ……………………
Electric motor | |
Photoelectric cell | |
Electric heater | |
Light bulb |
Question 15 |
Solar energy is converted into electrical energy………………
Electric motor | |
Photoelectric cell | |
Electric heater | |
Light bulb |
Question 16 |
Electrical energy is converted into heat energy ……………….
Electric motor | |
Photoelectric cell | |
Electric heater | |
Light bulb |
Question 17 |
Solar energy is converted into chemical energy………………..
Electric motor | |
Photoelectric cell | |
Photosynthesis in plants | |
Light bulb |
Question 18 |
Electrical Energy is converted into light energy…………………
Electric motor | |
Photoelectric cell | |
Photosynthesis in plants | |
Light bulb |
Question 19 |
Match the following:
Quantity Unit
- Kinetic energy - a) newton
- Electrical energy - b) watt
- Power - c) joule
- Force - d) kilowatt hour
3 4 1 2 | |
4 3 1 2 | |
1 3 4 2 | |
2 4 1 3 |
Question 20 |
Match the following:
- 1 Megawatt - a) W = F x S
- 1 Kilowatt hour - b) mgh
- Kinetic energy - c) 106 joules / second
- Work - d) 3600000 joules
- Potential energy - e) ½ mv2
3 4 5 1 2 | |
4 3 1 2 5 | |
4 5 1 2 3 | |
2 4 1 3 5 |
Question 21 |
- Assertion (A) : Windmills transform wind energy into mechanical energy.
- Reason (R) : Energy cannot be converted from one form to another.
A is correct, R is wrong | |
A is wrong, R is correct | |
A is correct, R explains A | |
Both A and R are correct |
Question 22 |
- Assertion (A) : If the body is displaced in the same direction as the force, the work is said to be done against the force.
- Reason (R) : Energy is the capacity to do work.
A is correct, R is wrong | |
A is wrong, R is correct | |
A is correct, R explains A | |
Both A and R are correct |
Question 23 |
- Assertion (A) : Heat is a form of energy.
- Reason (R) : Heat can do work. Eg. Steam engine
A is correct, R is wrong | |
A is wrong, R is correct | |
A is correct, R explains A | |
Both A and R are correct |
Question 24 |
High melting and boiling points ………….. Compounds
Ionic | |
Covalent |
Question 25 |
Low melting and boiling points ……………... Compounds
Ionic | |
Covalent |
Question 26 |
Transfer of electrons formed by ……………… Compounds
Ionic | |
Covalent |
Question 27 |
Sharing of electrons formed by ……………… Compounds
Ionic | |
Covalent |
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There are 27 questions to complete.
