Units and Measurements Test

Result

Units and Measurements Test - 6

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Weekly Quiz Competition

Question 1
1 / -0

The unit for the solid angle is

A
degree

B
rad

C
Sr

D
none of these

Solution

The unit of solid angle is steradian (Sr). One steradian is equal to (180/π)² square degrees.
Question 2
1 / -0

Which of the following is not a unit of power?

A
Wh

B
kW

C
HP

D
N ms^-1

Solution

Watt-hour (Wh) is not a unit of power. Wh is the unit of energy equivalent to one watt (1 W) of power expended for one hour (1 h) of time.
Question 3
1 / -0

Which of the following is a fundamental quantity?

A
Volume

B
Velocity

C
Time

D
Force

Solution

The seven fundamental quantities are weight, length, time, current, temperature, number of particles, and luminous intensity. Out of the four options, time is a fundamental quantity.
Question 4
1 / -0

Which is the correct unit for measuring astronomical distance?

A
Mole

B
Light Year

C
Kilometer

D
Angstrom unit
Question 5
1 / -0

Convert 5^` (minute of arc) into radians.

A
1.455 10^-3 rad

B
2.91 10^-4 rad

C
2.85 10^-6 rad

D
5.84 10 ^-4 rad

Solution

We know that 1 radian = 3437.75 minutes of arc
1 minute of arc = 1 ÷ 3437.75 radians
= 2.9 x 10^-4 radians
5 minutes of arc = 14.5 x 10^-4 radians or 1.45 x 10^-3 radians
Question 6
1 / -0

Convert /2 rad into degree.

A
180°

B
360°

C
90°

D
270°
Question 7
1 / -0

1 A° is equal to

A
10^–9 m

B
10^–10 m

C
10^–3m

D
10^–6 m
Question 8
1 / -0

One Light Year is equal to

A
9.46 10¹⁵ m

B
3.08 10¹⁶ m

C
1.66 10²⁷ m

D
2.76 10⁴ m
Question 9
1 / -0

One kilometer is equal to

A
10³ mm

B
10⁶ mm

C
10⁹ mm

D
10¹² mm

Solution

1 km = 1000 m
= 1000 x 100 cm
= 1000 x 100 x 10 mm
= 10⁶ mm
Question 10
1 / -0

The density of water is

A
0.1 kgm^-3

B
10 kgm^-3

C
100 kgm^-3

D
1000 kgm^-3

Solution

The density of water is 1 g/cm³.
1 g = 10^-3 kg
1 cm³= 10^-6 m³
1 g/cm³ = kg/m³ = 10³ kg/m³
Question 11
1 / -0

1Hz =?

A
rads^-1

B
s^-1

C
rad s^-1

D
s^-1

Solution

Hertz is the unit for measuring frequency.
We know, Frequency =
1 Hz =
Question 12
1 / -0

How many significant figures are there in 112.1100?

A
3

B
4

C
5

D
7
Question 13
1 / -0

Rounding off 85.32 to the nearest tenth gives

A
90.32

B
85.3

C
90.30

D
85.30
Question 14
1 / -0

763.46 on rounding off to the nearest hundred gives

A
763.50

B
800

C
763.00

D
700
Question 15
1 / -0

The length of a rod is (11.05 0.05) cm. What is the total length of two rods of the same kind?

A
(22.10.05) cm

B
(22.10.1) cm

C
(22.10.05) cm

D
(22.100.10) cm
Question 16
1 / -0

Rounding off number 8.750 up to two significant figure gives

A
8.7

B
8.75

C
8.8

D
8.70
Question 17
1 / -0

Error in the measurement of radius of sphere is 1%. The error in the measurement of volume is

A
1%

B
5%

C
3%

D
8%
Question 18
1 / -0

Which of the following is the most precise instrument for measuring length?

A
Metre rod of least count 0.1 cm

B
Vernier calliper of least count 0.01 cm

C
Screw gauge of least count 0.001 cm

D
An instrument of least count 1 cm
Question 19
1 / -0

A piece of metal has volume of 20 cc and mass 300 g. The density of metal will be

A
15 g cm^-2

B
15 g cm^-1

C
15 g

D
15 g cm^-3

Solution

Given: Mass = 300 g
Volume = 20 cc
Density = Mass ÷ Volume
= 300 ÷ 20
= 15 g cm^-3
Question 20
1 / -0

A piece of metal has mass 290 g and density 29 g cm^-3. Volume of the metal is

A
5 cc

B
10 cc

C
15 cc

D
20 cc

Solution

Given: Mass = 290 g
Density = 29 g/cm³
We know, Density = Mass ÷ Volume
Or, Volume = Mass ÷ Density = 290 ÷ 29 = 10 cc