Subject: Physics 8 (ch # 1,2,3) Marks: 14 Name:
_______________________
1)
Which one
of the following units is not a derived unit?
(a)
Pascal (b) kilogram (c) newton (d) watt
2) Which of
the following is a vector quantity?
a) speed b) power c) distance d) displacement
3) A
measuring cylinder is used to measure.
(a)
mass (b) area (c) volume (d) level of liquid
4)
Inertia
depends upon: (a) force (b)
net force (c) mass
(d) velocity
5)
A ball is
thrown vertically upward. Its velocity at the highest point is:
(a) -10 ms-1 (b) zero (c) 10
ms-2 (d)
none of them
6) The
prefix mili has a multiplier
a) 10-15 b)
10-13 c) 10-17 d)
10-3
7) A change
in position is called:
a) speed b) velocity c)
distance d) displacement
8) The SI
unit of momentum is:
a) Nm b) kgms-2 c)
kgms-1 d) Newton
9)
The number of base units in SI are:
a) 3 b) 6 c) 7 d) 9
10)
The prefix sector has a multiplier
a) 103 b) 10-3 c)
102 d) 10-2
11)
The symbol of Charge is
a) C b) V c)
Q d)
K
12)
The prefix Femto has a multiplier
a) 10-15 b)
10-13 c) 10-17 d) 10-12
13) Which of the following material lowers friction
when pushed between metal plates?
(a) water (b) fine marble powder (c)
air (d) oil
14)
A train is moving at a speed 36 kmh-1.
Its speed expressed in ms-1
(a) 10 ms-1 (b) 20 ms-1 (c) 25 ms-1 (d) 30 ms-1
Subjective Part
Physics 8th
(ch # 1,2,3) Total Marks: 36
2. Answer any Ten (10) of the following questions.
(10×2=20)
i.
How can you
calculate the distance traveled by a moving object with the help of a graph?
ii.
Your hair
grows at the rate of 1 mm per day. Find their growth rate in nm s-1.
iii.
Differentiate
between Mass & weight?
iv.
What
is meant by banking of road?
v.
How do the
prefixes micro, Nano, and Pico relate to each other?
vi.
How are vector quantities important to us in our
daily life?
vii.
What is meant by a coefficient of friction? Write its
mathematical form.
viii.
Describe ways to
reduce friction.
ix.
Which one of the two instruments is more precise and why? (a) Vernier
Calipers (b) Screw gauge
x.
Differentiate distance
and displacement.
xi.
Why is rolling friction
less than sliding friction?
xii.
A chocolate wrapper is 6.7 cm long and 5.4 cm
wide. Calculate its area up to a reasonable number of significant figures.
xiii.
Why is the use of zero error necessary in a measuring instrument?
xiv.
Define physics and write the names of its
branches.
Attempt any THREE (2) questions. (2×8 =16)
Q.1 (a) State and explain the law
of conservation of momentum. (4)
(b)
How much time is required to
change 22 Ns momentum by a force of 20 N? (4)
Q.2 (a) Derive
the equation of motion which is independent of time. (4)
(b) Body of 5 kg is moving with 10 ms-1. Find
the force required to stop it in 2 seconds. (4)
Q.3 (a) How can you relate a force with the change of momentum
of a body? (4)
(b) What are the
rules to find the significant figures in a measurement? (4)
