physics MCQs - 9th class Chapter 01 Mcqs

1

Which of the following is a non-physical quantity?

A

length

B

mass

C

love

D

time

2

A measurement consists of a number and a what?

A

symbol

B

prefix

C

unit

D

magnitude

3

How many base units are there in the International System of Units (SI)?

A

5

B

7

C

9

D

10

4

The SI unit for the amount of substance is?

A

gram

B

mole

C

candela

D

ampere

5

Which of the following is a derived quantity?

A

temperature

B

speed

C

mass

D

length

6

The unit 'pascal' (Pa) is a derived unit for which quantity?

A

force

B

energy

C

pressure

D

charge

7

The prefix 'giga' (G) represents a power of?

A

10^6

B

10^9

C

10^12

D

10^3

8

The prefix 'pico' (p) corresponds to which power of ten?

A

10^-9

B

10^-15

C

10^-6

D

10^-12

9

What is 1000 grams equal to?

A

1 milligram

B

1 megagram

C

1 kilogram

D

1 centigram

10

The expression 5.2 x 10^-11 m is an example of?

A

a prefix

B

a base unit

C

scientific notation

D

a derived quantity

11

The kilogram is the only base unit that has a?

A

symbol

B

prefix

C

standard definition

D

decimal value

12

The smallest measurement that can be taken accurately with a metre rule is?

A

0.1 mm

B

1 cm

C

1 mm

D

0.5 mm

13

The error caused by reading an instrument from an incorrect angle is known as?

A

zero error

B

systematic error

C

human error

D

parallax error

14

The least count of a standard Vernier Callipers is typically?

A

0.1 mm

B

0.01 mm

C

1 mm

D

0.5 mm

15

A Vernier (sliding) scale of a standard calliper is 9 mm long and is divided into how many equal parts?

A

5

B

20

C

15

D

10

16

Which part of the Vernier Callipers is used to measure the internal dimension of an object?

A

Jaws A and B

B

Jaws C and D

C

The tail

D

The main scale

17

If the zero of the Vernier scale is on the right side of the main scale's zero when jaws are closed, the zero error is considered?

A

positive

B

negative

C

neutral

D

zero

18

A positive zero error in a Vernier Callipers is corrected by?

A

adding it to the observed reading

B

multiplying it by the reading

C

ignoring it

D

subtracting it from the observed reading

19

The least count of a Micrometer Screw Gauge with 50 divisions on its circular scale is?

A

0.1 mm

B

0.05 mm

C

0.01 mm

D

1 mm

20

The pitch of a standard Micrometer Screw Gauge is?

A

1 mm

B

0.5 mm

C

0.1 mm

D

0.01 mm

21

What part of a Micrometer Screw Gauge prevents over-tightening?

A

spindle

B

sleeve

C

thimble

D

ratchet

22

If the zero of the circular scale is below the horizontal line when the screw gauge is closed, the zero error is?

A

positive

B

negative

C

absolute

D

relative

23

Mass is the measure of the quantity of matter, while weight is a?

A

force

B

pressure

C

volume

D

density

24

Which instrument is based on the principle of levers?

A

Spring Balance

B

Digital Balance

C

Physical Balance

D

Stopwatch

25

A mechanical stopwatch can measure time up to an accuracy of?

A

1/10th of a second

B

1/100th of a second

C

1 second

D

1/1000th of a second

26

An electronic/digital stopwatch can measure up to?

A

one tenth of a second

B

one thousandth of a second

C

one hundredth of a second

D

one minute

27

In a measuring cylinder, the surface of water curves downward. This surface is called?

A

convex meniscus

B

concave meniscus

C

level surface

D

top edge

28

To measure the volume of an irregularly shaped solid that does not fit in a measuring cylinder, one should use a?

A

physical balance

B

beaker

C

displacement can

D

metre rule

29

Errors that occur due to a definite rule, such as a zero error or poor calibration, are called?

A

human errors

B

random errors

C

parallax errors

D

systematic errors

30

Sudden fluctuations in temperature or pressure during an experiment can cause what type of error?

A

systematic error

B

human error

C

random error

D

zero error

31

How can the effect of random errors be reduced?

A

by using a different instrument

B

by taking a single, careful reading

C

by taking multiple readings and averaging them

D

by correcting for zero error

32

The uncertainty in a measurement made with a metre rule calibrated in millimeters is?

A

± 0.1 cm

B

± 1 mm

C

± 0.05 cm

D

± 0.5 mm

33

The accurately known digits and the first doubtful digit in a measurement are known as?

A

base units

B

prefixes

C

significant figures

D

derived units

34

How many significant figures are in the measurement 5.06 m?

A

1

B

2

C

3

D

4

35

How many significant figures are there in 0.0034 m?

A

5

B

4

C

3

D

2

36

In scientific notation, such as 3.50 x 10^4 m, how many significant figures are there?

A

2

B

3

C

4

D

5

37

Precision of a measurement refers to?

A

how close the measurement is to the true value

B

the number of significant figures

C

how close a group of measurements are to each other

D

the smallest division on the instrument

38

Accuracy of a measurement is related to?

A

how close the measured value is to the true value

B

the consistency of repeated measurements

C

the least count of the instrument

D

the number of decimal places

39

A more precise instrument has a?

A

larger least count

B

smaller least count

C

higher number of errors

D

simpler scale

40

Which timing device is the most precise for measuring very short intervals like 10^-10 seconds?

A

Digital stopwatch

B

Analogue stopwatch

C

Atomic clock

D

Ticker-tape timer

41

When rounding off 2.512 to two significant figures, the result is?

A

2.5

B

2.6

C

2.51

D

3.0

42

The unit of a light year is used to measure?

A

time

B

speed of light

C

distance

D

brightness

43

A displacement can is used to measure the?

A

mass of a liquid

B

volume of a solid

C

density of a solid

D

mass of a solid

44

Four students measure the diameter of a cylinder and get 3.475 cm. The instrument used likely has a least count of?

A

0.1 cm

B

0.01 cm

C

0.001 cm

D

1 cm

45

Which of the following errors can be reduced by using automated instruments?

A

Systematic Errors

B

Random Errors

C

Zero Errors

D

Human Errors

46

The SI unit for intensity of light is?

A

Lumen

B

Lux

C

Candela

D

Watt

47

The prefix 'femto' is equal to?

A

10^-12

B

10^-9

C

10^-18

D

10^-15

48

Which instrument is most suitable for measuring the thickness of a single sheet of paper?

A

Metre rule

B

Measuring tape

C

Vernier Callipers

D

Micrometer Screw Gauge

49

The number 2000 µs can be written as?

A

2 s

B

2 ms

C

0.2 s

D

0.02 s

50

The reading for the volume of a liquid in a measuring cylinder should be taken from the?

A

top of the meniscus

B

bottom of the concave meniscus

C

average of top and bottom

D

eye level above the meniscus