Unit 1

Physical Quantities, Unitsand Measurement

1. The diagram below shows the scale of a verniercalipers when its jaws are closed. What is the zero

reading?

A I onlyB I and II onlyC III onlyD All of them

5. Compared to 10 kg of feathers, 8 kg of iron has

A less mass and less inertia.B less mass and more inertia.C more mass and less inertia.D more mass and more inertia. ( )

6. Which of the following is a scalar quantity?

A The braking force needed to stop a car

B The effort needed to hammer a nail into woodC The heat needed to boil some waterD The thrust needed to lift a rocket offthe

ground ( )

7. What would you use to measure the diameter of a

beaker in a lab?

A micrometer screw gauge

B measuring tape

C venier calipersD metre rule ( )

8. In an experiment to determine the density of sand,

the measurements as shown below are obtained.

If the density of water is 1.00 g cm-3, what is the

density of the sand?

empty

mass = 308 g mass = 808 g

66s5 = 1200 g mass = 1500 g

0

cm

A +0.08 cmC -0.03 cm

2. \t a micrometer screw gauge, the ratchet is used toA turn the circular scale.

B correct the zero error.C lock the spindle.D apply the correct pressure. ( )

3. A lump of metal of mass 40 g and density 8 g/cm3is lowered into a displacement can as shown inthe diagram.

What is the volume ofwater displaced?

A 5cm3 B 8cm3C 32 cm3 D 40 cm3

4. Which group of quantities consists of all vectors?

I mass, force, weightII weight, acceleration, work done

III weight, displacement, force

B -0.07 cmD -0.02 cm

A 2.22 gcm-3

C 3.13 g cm-3

B 2.47 gcm-3D 4.46 gcm3 ( )

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9. A student has been asked to calculate the volumeof a piece of wire, which is about 80 cm longand about 0.2 cm in diameter. Which measuringinstruments should the student use?

Length DiameterA metre rule vernier caliperB metre rule micrometer screw gaugeC micrometer vernier caliper screw gaugeD vernier caliper micrometer screw gauge

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10. A micrometer screw gauge shows a zero error as

represented by the diagram. When it is used totake a reading, it must be corrected by

A adding 0.02 mm.B subtracting 0.02 mm.C adding 0.002 mm.D subtracting 0.002 mm.

11. Weights attached to two suspended strings are

given small displacements and allowed to swingfreely. Their periods of oscillation will be equal ifthey have the same

A length of string.B mass.

C initialdisplacement.D amplitude of swing. ( )

1.2. \\e periodic time of a simple pendulum can besignificantly reduced byA increasing the mass of the pendulum.B decreasing the mass of the pendulum.C decreasing the length of the pendulum.D increasing the length of the pendulum.

()

13. Ten identical steel balls were immersed in a

measuring cylinder containing 20 cm3 of water.The reading of the water level rose to 50 cm3.

If the density of steel is 9.0 g cm-3, what is themass of one ball?A 3g B 27gC a5g D 270s ( )

74. the density of a gold bar is 19.0 g cm-3.When a

hole of volume 1.0 cm3 is drilled into the bar, the

A 18.0gcm3 B 19.0gcm-3C 19.5 g cm-3 D 20.0 g cm-3 ( )

15. Which one of the following statements regardingthe period of a simple pendulum is correct?A It is independent of mass.B It doubles when length doubles.C It does not change when the pendulum is

brought up to a very high mountain.D It decreases when the length increases.

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16. A lump of metal of mass 40 g and density8.0 g cm-3 is lowered into a displacement can as

shown in the diagram below. What is the volumeof water displaced?

water

metal)

A 5cm3C 32 cm3

B 8cm3D 40 cm3 (

77. A simple pendulum oscillates between P and R. Ifthe period of pendulum is 2.0 s, what is the timeit takes to move from Qto R?

RP

o

A 0.5sC 1.5s

18. Which of the following set shows scalar quantitiesonly?A mass, speed, densiry forceB time, mass, volume, speedC weight, velociry acceleration, forceD mass, time, volume, acceleration ( )

19. A pendulum makes 50 complete oscillations in 20seconds.What is the frequency of the oscillations?A 0.4H2 B 2.5H2C 20Hz D 1000 Hz ( )

B 1.0sD 5.0s

density of the gold bar will be

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20. The diameter of a steel ball is measured using a

micrometer screw gauge. A student takes an initialzero reading and then a reading of the diameter.The following diagrams show enlargements of thescrew gauge readings.

zero reading

mm 0

diameter reading

What is the diameter of the ball?A 3.48 mm B 2.04 mmC 1.98 mm D 1..92 mm

21. the bob of a simple pendulum is swingingbetween X and Y.It takes 9.4 s to swing from X to Y and back toX twenty times.

24. An astronaut has a mass of 60 kg on Earth. Hecan jump 1.5 m high on the surface of Earth.Which of the following statements regarding thedistance he can on jump on the Moon and thecorresponding reason are correct? Assume thatthe acceleration due to gravity on the Moon is

1.6 m s-2.

Distance he canjump ontheMoon Reason

A higher than his mass is less

1.5 m than on EarthB higher than his weight is less

1.5 m than on EarthC lower than his weight is more

1.5 m than on EarthD lower than his weight is more

1.5 m than on Earth()

25. The results obtained in an experiment to determinethe density of a plastic material are illustrated inthe diagram below.

plasticmaterial 85 cms

'103 cm3

plasticmaterial

A 5.31mmC 7.537 mm

B 5.531mmD 7.81mm

10

5

0

mm

5

0

45

What is the period of the pendulum?A 0.47 s B 0.94 s

C 47s D 94s

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22. the periodic time of oscillation of a simple

pendulum may be significantly reduced byA decreasing the mass of the pendulum bob.

B decreasing the angle of the swing of the

pendulum.C decreasing the length of the pendulum.D increasing the mass of the pendulum bob.

()

23. A student used a micrometer screw gauge to

measure the thickness of a metal sheet. The

diagram shows part of the micrometer. What isthe thickness of the metal sheet?

What is the density of the plastic material?

A 400 , 10-2 g cm-3 B 25 x 10-2 g cm-3

C 5.3 ' 10-2 g cm-3 D 4.4 x 10-2 g cm-3(

04.5 g

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26. An astronaut lands on a planet where theacceleration of free fall at its surface is greaterthan that on Earth. Which one of the followingwill be the same as on Earth?A The period of oscillation of a simple pendulumB The weight of the astronaut as measured by a

spring balance

C The ease of changing the motion of a

swinging can of sand

D The height reached by the astronaut when hejumps with the same initial velocity ( )

27. the diameter and length of a wooden rod of mass

22 gare 1 cm and 40 cm respectively.

What is the density of the wooden rod in g/cm3?

A 0.35 B 0.55c o.7o D 1.43 ( )

28. A container filled with a liquid is moving forwardwith constant velocity. There is a bubble in thecontainer. What happens to the air bubble if thecontainer is stopped suddenly?

30. We say that the density of iron is 7.9 g cm-3. Thiscan also be written as

A 7.9kgm3. B 79kgm-3.C 790 kg m-3. D 7900 kg m-3.

()

31. An object X floats in liquid R but sinks in liquidS. Which of the following statements is correct?A Liquid R is less dense than object X.B Liquid S is denser than object X.C Liquid S is less dense than liquid R.D Liquid S is denser than liquid R. ( )

32. A simple pendulum is 1.0 m long and carries a

50 g bob. It takes 0.8 s to complete 1 swing. Ifthe 50 g bob is replaced by a 200 g bob (with thelength unchanged), how long does it take for thenew pendulum to complete 1 swing?A 0.4s B 0.8sC 1.6s D 3.2s ( )

33. The mass and the corresponding volume of threeliquids X,Y and Z are recorded below.

torward motion air bubble

A Air bubble will move in the forward direction.B Air bubble will remain at the original position.C Air bubble will move in the backward

direction.D Motion of air bubble cannot be determined

as the total mass of the liquid is unknown.()

29. It takes 36.5 s for a pendulum to swing from Xto Y and back again twenty times. What is thefrequency of the pendulum?

The three liquids,which do not mix, are poured intoa beaker as shown in the figure above. Starting fromthe top, the liquids will be in the orderAYZX. B XYZ.c Yxz. D xzY. ( )

34. Shown below are two enlarged vernier scales. Theone on the top shows when the vernier is closedand the other after measuring the diameter of a

steel ball bearing.

tr

o mm

A 0.274H2C 1.83H2

B 0.548H2D 2.74H2

0

I5

mm

I0

X 2729 | '20.-'Y 40g | 50.*'Z 36 s | :0.*'

Liquid Mass Volume

I0

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35. In the diagram below, the horizontal scale givesthe reading in mm above the axis and half mmbelow the axis. What is the micrometer readingshown?

A 5.224 cmC 7.24mm

B 1.56 cmD 1.64cm ( )

B 5.274mmD 7.74 mm

The correct value for the diameter of the steelball bearing is

A 1.54 cmC 1.58 cm

38. Frve identical iron balls, each of mass 25 g, wereimmersed in a measuring cylinder containing30 cm3 ofwater.The reading of the water level roseto 50 cm3. What was the density of the iron?A 0.50 g cm-3 B 1..25 g cm 3

C 5.00 g cm-3 D 6.25 g cm-3 ( )

39. A pendulum clock is found to gain 10 minutesper day. This clock can be corrected byA increasing the amplitude of oscillation.B decreasing the amplitude of oscillation.C increasing the length of pendulum.D decreasing the length of pendulum.

()

40. The figure below shows some liquid in a measuringcylinder. What is the volume of the liquid?

40

B 43 cm3

D 45 cm3

47. A piece of wire is wound tightly round a pen as

shown in the diagram. The turns are next to one

another but not overlapping.

of wire

When there are 700 turns of the wire, the lengthof pen covered by the wire is found to be 4.9 cm.

What is the average diameter of the wire?

A 0.07 mm B 0.35 mmC 0.49 mm D 0.70 mm ( )

30

25

20

15

36. The diagram shows the barrel (S) and the rotatingthimble (T) of a micrometer screw gauge.

The divisions shown above the horizontal line onthe barrel are millimetres and those below the lineon the barrel are the half-millimetres.There are 50divisions around the rim of the thimble ofwhichsome are shown in the diagram.The correct reading of the instrument, as shown,is

A 2.20mm. B 2.23mm.C 2.25 mm. D 2.28 mm. ( )

37. Which property of a solid would change if it is

transported from Earth to the Moon?A Inertia B DensityC Heat capacity D Weight ( )

T

S

A 42 cm3

C 44 cm3

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