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PHYSICS [1 Mark Question Answer]

Measurement and Experimentation · ICSE STD 9 (ICSE - English Medium). 9 questions.

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[1 Mark Question Answer]

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Question 11 Mark
A simple pendulum is hollow from within and its time period is $T$. How is the time period of pendulum affected when:
(a) $1 / 4$ of bob is filled with mercury
(b) $3 / 4$ of bob is filled with mercury
(c) The bob is completely filled with mercury?
Answer
We know that time period of a simple pendulum is independent of its mass. So in all the above said cases, time period of simple pendulumn remains same.
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Question 21 Mark
Which of the following do not affect the time period of a simple pendulum?
(a) mass of bob
(b) size of bob
(c) effective length of pendulum
(d) acceleration due to gravity
(e) amplitude.
Answer
(a) Mass of the bob, and (b) Size of the bob, do not affect the time period of a pendulum. Also time period of pendulum is independent of the amplitude provided this is not too great.
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Question 31 Mark
Amongst the units of volume (i) $cm ^3$ (ii) $m ^3$ (iii) litre (iv) millilitre, which is most suitable for measuring:
(a) Volume of a swimming tank
(b) Volume of a glass filled with milk
(c) Volume of an exercise book
(d) Volume of air in the room.
Answer
(a) litre
(b) $cm ^3$
(c) millilitre
(d) $m ^2$
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Question 41 Mark
What is the function of ratchet in screw gauge?
Answer
When the flattened end of the screw comes in contact with stud, ratchet becomes free and makes a rattling noise. It indicates that screw should not be further pushed towards the stud.
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Question 51 Mark
For what range of measurement is micrometre screw gauge used?
Answer
Micrometre screw gauge is used to measure upto the accuracy of 0.001 cm .
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Question 61 Mark
Up to how many decimal places can a common vernier callipers measure the length in cm ?
Answer
A common vernier calliper can measure the length accurately upto two places of decimal when length is measured in centimetre
i.e. upto $1 / 100$ th part of a centimetre.
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Question 71 Mark
What is the need for measuring length with vernier callipers?
Answer
For measuring the exact length with greater accuracy, especially when we are measuring a very small length, we use an appliance vernier calliper. A vernier calliper can measure accurately upto $1 / 100$ th part of a centimetre.
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Question 91 Mark
State the factors which determine number of significant figures for the calculation of final result of an experiment.
Answer
Factors which determine number of significant figures for the calculation of final result of an experiment are :
1. The nature of experiment.
2. The accuracy with which various measurements are made.
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[1 Mark Question Answer] - PHYSICS STD 9 Questions - Vidyadip