Physics Practice Question and Answer
6 Q: What is the ratio of power dissipated if two electric bulbs are connected in series and the ratio of their resistance is 1:2?
376 063c8d8afbd6d90332091d175
63c8d8afbd6d90332091d175- 11:4false
- 21:2true
- 32:1false
- 41:1false
- Show AnswerHide Answer
- Workspace
- SingleChoice
Answer : 2. "1:2"
Q: Which among the following instruments is used to measure either direct or alternating electric current?
360 064b17cd02dc867f593e95d61
64b17cd02dc867f593e95d61- 1Wattmeterfalse
- 2Hygrometerfalse
- 3Ammetertrue
- 4Pyrometerfalse
- Show AnswerHide Answer
- Workspace
- SingleChoice
Answer : 3. "Ammeter"
Explanation :
1. The device which is used to measure electric current in an electric circuit is called ammeter.
2. The resistance of an ideal ammeter is always zero and the electric circuit is always connected in series.
Q: What happens to the force acting between the charged particles, if the distance between these charged particles is halved?
352 063c8e92bbdbddb32fda08d59
63c8e92bbdbddb32fda08d59- 1It increases by four timestrue
- 2It gets doubledfalse
- 3It becomes halffalse
- 4It reduces by one-fourthfalse
- Show AnswerHide Answer
- Workspace
- SingleChoice
Answer : 1. "It increases by four times "
Explanation :
So, when the distance between the two charges is halved, the force is increased four times.
Q: Why do the astronauts in the international space station experience weightlessness?
349 063c7a8631e8e3f3e1a3590ed
63c7a8631e8e3f3e1a3590ed- 1The acceleration due to gravity at that height is Zerofalse
- 2They are falling towards the earthtrue
- 3They have specially designed spacesuits for this purposefalse
- 4The gravity of the moon and earth cancel out at that altitudefalse
- Show AnswerHide Answer
- Workspace
- SingleChoice
Answer : 2. "They are falling towards the earth"
Q: Identify the correct statement.
334 0649aa3043662c8741dfd960b
649aa3043662c8741dfd960b- 1Newton is a unit of force.true
- 2Newton is a unit of power.false
- 3Joule is a unit of force.false
- 4Joule is a unit of power.false
- Show AnswerHide Answer
- Workspace
- SingleChoice
Answer : 1. "Newton is a unit of force."
Explanation :
1. Newton is the SI unit of force. It is a unit force that causes an acceleration of one meter per second on one kilogram of mass.
- Force can be defined as:
Force =Mass x Acceleration
2. Joule is the SI unit of energy and work. It is the unit work done by one Newton force over a distance of one meter.
- Energy can be defined as:
Energy = Work x Time
Q: What makes a virtual image of a real object?
1 05f6da2bdec13dd748004c084
5f6da2bdec13dd748004c084- 1convex mirrorfalse
- 2plane mirrortrue
- 3concave mirrorfalse
- 4All of thesefalse
- Show AnswerHide Answer
- Workspace
- SingleChoice