Well structured WBBSE Class 9 Physical Science MCQ Questions Chapter 1 Measurement can serve as a valuable review tool before exams.
Measurement Class 9 WBBSE MCQ Questions
Multiple Choice Questions :
Question 1.
What is the SI unit of temperature ?
(i) calorie
(ii) kelvin
(iii) centrigrade
Answer:
Kelvin.
Question 2.
Which unit should be chosen to measure the distance between two stars ?
(i) kilometre
(ii) femtometre
(iii) light year
Answer:
light year.
Question 3.
Which physical quantity has the dimension [MLT-2] ?
(i) velocity
(ii) acceleration
(iii) temperature
Answer:
acceleration.
Question 4.
What is the unit of atomic weight ?
(i) gram
(ii) milligram
(iii) no unit
Answer:
no unit.
Question 5.
At what temperature density of water is maximum ?
(i) 0°C
(ii) 4°C
(iii) 1 K
Answer:
4°C.
Question 6.
Of the following quantities, which is scaiar quantity ?
(i) velocity
(ii) time
(iii) weight
(iv) force
Answer:
time.
Question 7.
The dimension of velocity is :
(i) [LT-1]
(ii) [M L T-2]
(iii) [M L-1 L-2]
(iv) [M L T-1]
Answer:
[LT-1].
Question 8.
Which one is not fundamental unit ?
(i) metre
(ii) litre
(iii) kilogram
(iv) second
Answer:
litre.
Question 9.
Light year is the unit of :
(i) time
(ii) distance
(iii) temperature
Answer:
distance.
Question 10.
To measure the diameter of an atom, the unit is used :
(i) ohm
(ii) metre
(iii) fermi
(iv) millilitre
Answer:
fermi.
Question 11.
1 fermi is :
(i) 10-15 metre
(ii) 10-10 metre
(iii) 10-5 metre.
Answer:
10-15 metre.
Question 12.
1 X-unit is :
(i) 10-13 cm
(ii) 10-12 cm
(iii) 10-11 cm
Answer:
10-11 cm.
Question 13.
1 light year is :
(i) 9.45 × 1010 km
(ii) 9.47 × 1011 km
(iii) 9.467 × 1012 km.
Answer:
9.467 × 1012 km.
Question 14.
Which one is scalar quantity :
(i) acceleration
(ii) velocity
(iii) work
Answer:
work.
Question 15.
An object has density 4 g c .c. and volume 20 c.c.. What will be the mass of the object ?
(i) 80 g
(ii) 40 g
(iii) 5 g.
Answer:
80 g.
Question 16.
Identify the vector quantity :
(i) mass
(ii) volume
(iii) time
(iv) weight
Answer:
Weight.
Question 17.
The unit of volume is :
(i) fundamental unit
(ii) derived unit
(iii) none of these
Answer:
derived unit.
Question 18.
The density of Hg is :
(i) 13.6 g c. c.
(ii) 12.6 g c. c.
(iii) 11.6 g c. c.
Answer:
13.6 g c. c.
Question 19.
The watch used in run competition is :
(i) pendulum clock
(ii) stopwatch
(iii) table clock
Answer:
stopwatch.
Question 20.
The dimension of Retardation is :
(i) [LT-1]
(ii) [LT-2]
(iii) [LT]
Answer:
[LT-2]
Question 21.
1 per sec is :
(i) 30.84 km
(ii) 29.75 km
(iii) 28.82 km
Answer:
30.84 km
Question 22.
1 Astronomical unit (Au) is :
(i) 1.495 × 108 km
(ii) 2.57 km
(iii) 3.82 km
Answer:
1.495 × 108 km .
Question 23.
The dimensions of force are :
(i) [M2 L T-2]
(ii) [M L-2 T-2]
(iii) [M L T2]
(iv) [MLT-2]
Answer:
[MLT-2]
Question 24.
The prefix mega stands for
(i) 10-9
(ii) 108
(iii) 107
(iv) 106
Answer:
106
Question 25.
The periodic time of a simple pendulum is propartional to
(i) its lengths
(ii) square root of its length
(iii) reciprocal of its length
(iv) square of its length
Answer: Square root of its length.
Question 26.
One litre stands for :
(i) 103 m3
(ii) 10-3 m3
(iii) 10 m3
(iv) 100 m3
Answer:
10-3 m3
Fill in the blanks
1. A scalar physical quantity can be expressed with its magnitude but _________ any direction.
Answer:
without.
2. _________ physical quantities are those, each of which associates one or more fundamental physical quantities.
Answer:
Derived.
3. A vector physical quantity is expressed with magnitude, proper unit as well as a _________.
Answer:
direction.
4. Physical quantities are of two types, _________ and vector.
Answer:
scalar.
5. Any __________ quantity related to a material body or any natural or mechanical event is known as a physical quantity.
Answer:
measurable.
6. The time that elapses between two consecutive apparent transits of the Sun across the __________ at a place is known as Solar day.
Answer:
meridian.
7. Dimension is a _________ or quotient of the fundamental quantities involved in a derived physical quantity raised to appropriate powers.
Answer:
product.
8. Some physical quantities have no units, since each is expressed by a _________ of similiar physical quantities.
Answer:
ratio.
9. Derived units are obtained by using a fundamental unit more than once or by using two or more __________ units.
Answer:
fundamental.
10. Measurement of a physical quantity means to compare it with a standard physical quantity of the _________ nature accepted by all in the world.
Answer:
same.
11. Spring balance measures the __________ of a body.
Answer:
weight.
12. __________ is the mass per unit volume.
Answer:
Density.
13. Velocity is a _________ quantity.
Answer:
vector.
14. Anything that can be measured is a _________ quantity.
Answer:
physical.
15. CGS system is also known as ___________ system.
Answer:
metric.
16. InCGS system unit of mass is __________.
Answer:
gram.
17. InCGS system, unit of density is ___________.
Answer:
g/c.c.
18. Mass of 1 c.c. of pure water at 4°C is ___________.
Answer:
1 g.
19. A measuring cylinder is used for measuring the volume of a _____________.
Answer:
liquid.
20. The weights in the weight box are in the ratio of ___________.
Answer:
5 : 2 : 2 : 1
21. Work is a ___________ quantity.
Answer:
scalar.
22. 1 A° = ___________ cm.
Answer:
10-8
23. The dimension of force is ____________.
Answer:
[MLT-2]
24. Stopwatch has no __________ hand.
Answer:
hour.
25. The light year is the unit of ____________.
Answer:
distance
26. Small time intervals are measured by ___________.
Answer:
stopwatch.