| 1. | A machine having an efficiency greater than 50%, is known as ? | |
|
reversible machine
|
||
|
a non-reversible machine
|
||
|
neither reversible nor non-reversible machine
|
||
|
ideal machine
|
||
View Answer
Discuss in Forum
Report Question| 2. | The mechanical advantage of a lifting machine is the ratio of ? | |
|
distance moved by effort to the distance moved by load
|
||
|
load lifted to the effort applied
|
||
|
output to the input
|
||
|
all of the above
|
||
| 3. | Which of the following statement is correct ? | |
|
The kinetic energy of a body during impact remains constant
|
||
|
The kinetic energy of a body before impact is equal to the kinetic energy of a body after impact
|
||
|
The kinetic energy of a body before impact is less than the kinetic energy of a body after impact
|
||
|
The kinetic energy of a body before impact is more than the kinetic energy of a body after impact
|
||
| 4. | The law of motion involved in the recoil of gun is ? | |
|
Newton's first law of motion
|
||
|
Newton's second law of motion
|
||
|
Newton's third law of motion
|
||
|
none of these
|
||
| 5. | One watt is equal to ? | |
|
0.1 joule/s
|
||
|
1 joule/s
|
||
|
10 joules/s
|
||
|
100 joules/s
|
||
| 6. | One kg force is equal to ? | |
|
7.8 N
|
||
|
8.9 N
|
||
|
9.8 N
|
||
|
12N
|
||
| 7. | The three forces of 100 N, 200 N and 300 N have their lines of action parallel to each other but act in the opposite directions. These forces are known as ? | |
|
coplaner concurrent forces
|
||
|
coplaner non-concurrent forces
|
||
|
like parallel forces
|
||
|
unlike parallel forces
|
||
| 8. | The friction experienced by a body, when at rest, is known as ? | |
|
static friction
|
||
|
dynamic friction
|
||
|
limiting friction
|
||
|
coefficient of friction
|
||
| 9. | When a rigid body is suspended vertically, and it oscillates with a small amplitude under the action of the force of gravity, the body is known as ? | |
|
simple pendulum
|
||
|
compound pendulum
|
||
|
torsional pendulum
|
||
|
second's pendulum
|
||
| 10. | The unit of force in S.I. system of units is ? | |
|
dyne
|
||
|
kilogram
|
||
|
newton
|
||
|
watt
|
||