Units and Measurements Test

Result

Units and Measurements Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

What is the total number of fundamental units in the SI system of measurement?

A
5

B
7

C
9

D
6
Question 2
1 / -0

Light Year is the unit of

A
intensity of illumination

B
distance

C
time

D
parallax

Solution

The light-year is a unit of length used to express astronomical distances. It is about 9.5 quadrillion metres or 5.9 trillion miles. As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in vacuum in one Julian year (365.25 days).
Question 3
1 / -0

SI unit of temperature is

A
degree Kelvin

B
Kelvin

C
degree Celsius

D
Celsius

Solution

The SI unit of temperature is Kelvin.
Question 4
1 / -0

Which of the following is a derived unit?

A
Mass

B
Length

C
Time

D
Velocity
Question 5
1 / -0

Which of the following relations is correct?

A
180° = rad

B
90° = 2 rad

C
270° = rad

D
360° = rad
Question 6
1 / -0

1 fermi is equal to

A
10^-9 m

B
10^-10 m

C
10^-12 m

D
10^-15 m

Solution

1 fermi = 0.001 picometre
0.001 picometre = 10^-15 metre = 1 fermi
Question 7
1 / -0

Size of a proton is of the order of

A
10^-4 m

B
10^-10 m

C
10^-14m

D
10^-15 m
Question 8
1 / -0

Find the value of one year in SI units, assuming that the year is not a Leap Year.

A
3600 s

B
3.15 6 10⁷ s

C
8.64 10²s

D
2.58 10⁴ s

Solution

Value of one year in SI units means that the answer should be in seconds.
1 year = (365 x 24 x 60 x 60) s
= 31536000 s
= 3.154 x 10⁷ s
Question 9
1 / -0

Density of a liquid is 10 gcm^-3. Its value in SI units is

A
10²

B
10³

C
10⁴

D
10⁶

Solution

Density in SI units means that the answer should be in kg/m³.
10 g = 0.01 kg = 10^-2 kg
1 cm³= 10^-6 m³

10 g/cm³ =
=
Question 10
1 / -0

One horse power is equal to

A
746 watts

B
746 kilowatts

C
746 megawatts

D
None of these

Solution

Horse power is the unit for measuring the power. One horse power is equal to 746 watts or 0.746 watts or 0.000746 megawatts.
Question 11
1 / -0

One nanometer is equal to

A
10⁹ cm

B
10^-6 cm

C
10^-7cm

D
10^-9 cm

Solution

The word `nano` means that a quantity is getting smaller by 10⁹ times.
1 nm = 10^-9 m
= 10^-9 x 10² cm
= 10^-7 cm
Question 12
1 / -0

Earth`s radius is 6.37 10⁶ m and its average density is 5.517 10³ kg m^-3. Calculate the mass of Earth to correct significant figures?

A
5974 10²¹ kg

B
5974.01 10²¹ kg

C
5.97 10²⁴ kg

D
6 10²⁴ kg
Question 13
1 / -0

How many significant figures are there in 0.002002?

A
4

B
6

C
7

D
12
Question 14
1 / -0

How many significant figures are there in 3.1 + 1.222?

A
1

B
2

C
4

D
15
Question 15
1 / -0

How many significant figures are there in 1.000 10³?

A
4

B
8

C
1

D
12
Question 16
1 / -0

Each side of a cube is measured to be 6.154 m, what is the volume of the cube to appropriate significant figures?

A
233.1 m³

B
233.06 m³

C
233.10 m³

D
233.063 m³
Question 17
1 / -0

The least count of an instrument is 0.01 cm. Taking all precautions, the maximum possible error in the measurement can be

A
0.005 cm

B
0.001 cm

C
0.01 cm

D
0.02 cm
Question 18
1 / -0

The least count of a stop-watch is second. The time of oscillation of a pendulum is measured to be 25 seconds. Minimum percent error in the measurement of time will be

A
0.1%

B
0.8%

C
1.3%

D
8%
Question 19
1 / -0

A piece of a metal has volume 20 cc and mass 290 g. The density of the metal will be

A
145 g cm^-3

B
14.5 g cm^-3

C
194 g cm^-3

D
19.47 g cm^-3

Solution

Given, Volume = 20 cc
Mass = 290 g
Density = Mass ÷ Volume = 290 ÷ 20 = 14.5 gcm^-3
Question 20
1 / -0

The density of a metal is 18.5 gm cm^-3. If the volume of metal is 14 cc, then the mass of the metal is

A
259 cc

B
259 gm

C
259 cm³

D
259 cm^-3

Solution

Given, Density = 18.5 gcm^-3
Volume = 14 cc
We know, Density = Mass ÷ Volume
Mass = Density x Volume
= 18.5 x 14 = 259 gm