test of physics f x class

1. physics test March 27, 2015
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Part A
MCQs
Note: Choose the right answer.
1: A …………. Is a notion of a scientist on which he tries to explain the phenomenon?
a) Theory b) hypothesis c) observation d) scientific law
2: …………..error is called zero error.
a) Personal b) Random c) Systematic d) N.O.T
3: ……….means comparison of unknown quantity with a standard.
a) Physical quantity b) Measurement c) Derived quantity d) Basic quantity
4: A body moves in a straight or curved path is called …………motion.
a) Stationary b) rotatory c) oscillatory d) vibratory
5: If the velocity of a body decreases continuously then the acceleration is saidto be negative and
is called……….
a) Deceleration b) retardation c) uniform acceleration d) average acceleration
𝟔: Change in velocity of the body as the result of gravitational attraction is called…………
a) Uniform speed b) gravity c) deceleration d) momentum
7: ………may be defined as any agent which produces distortion in a body to which it is applied.
a) inertia b) velocity c) motion d) force
8: (5.0× 𝟏𝟎 𝟒
) × (3.0× 𝟏𝟎−𝟔
)=
a) 1.5 × 𝟏𝟎−𝟑
b) 1.5 × 𝟏𝟎−𝟏
c) 𝟏. 𝟓 × 𝟏𝟎 𝟏
d) 1.5 × 𝟏𝟎−𝟑
9: Force can cause objects to …….
a) start moving b) stop moving c) change direction d) A.O.T
10: ……..is the tendency of an object not to accelerate.
a. mass b. force c. momentum d. inertia
11: …….is the measure of the amount of matter in a object, is also a measure of the inertia of an
object.
a) mass b) volume c) speed d) force
12: A ball is thrown vertically upwards with a velocity of 98 m/s and after 1 second it reaches the
maximum height. The acceleration of the ball is………
a) 98 m/s/s b) -98 m/s/s c) 9.8 m/s/s d) -9.8 m/s/s

2. physics test March 27, 2015
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13: If the velocity of moving body decreases by equal amounts in equal intervals of time, how
small they may be, the body is said to have ……….acceleration.
a) zero b) uniform & +ve c) uniform & -ve d) N.O.T
14: The weight of tyre is 4N. A force of 28 is required to drag it on the road. Find the coefficient
of friction between the tyre and the road.
a) 7 b) 0 .7 c) 98 d) 12
15: A body of mass 1 kg is moving with a velocity of 15 m/s. A constant force acts for 4 seconds
and reduces its velocity to 2 m/s. what is the momentum after the application of force.
a) 100 N/s b) 20 N/s c) 40 N/s d) 8 N/s
Part B
REASONING
Note: Give the suitable reason to the following questions.
Q.1: The force due to gravity is twice as great on a 2 kg rock as it is on a 1kg rock. Why doesn’t
the 2 kg rock have greater free-fall acceleration?
Q.2: A truck loaded with sand accelerates at .5 m/s2 on the highway. If the driving force on the
truck remains constant, what happens to the trucks acceleration if sand leaks at a constant rate
from a hole in the truck bed?
Q.3: If a small sports car collides head-on with a massive truck, which vehicle experiences the
greater impact force? Which vehicle experiences the greater acceleration?
Q.4: What is the initial velocity of the car which starts from rest?
Q.5: What is the acceleration of a body moving with uniform velocity?
Part C
Short Answers
Note: Answers any ten questions.
Q.1: What is Physics? Name some important branches of Physics.
Q.2: What is the contribution of Al-Haitham in the field of Physics?
Q.3: Write the seven S.I fundamental quantities units.
Q.4: What is Random error?

3. physics test March 27, 2015
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Q.5: What do you mean by a negative of vector?
Q. 𝟔: A force of 35N acts at the angle of 45 with the horizontal. Find its horizontal and vertical
components.
Q.7: Derive third equation of motion.
Q.8: A stone is dropped from the top of the building. It reaches the ground in 5s. Calculate the
height of the building.
Q.9: Explain the law of conservation of momentum.
Q.10: What is the difference between Mass and Weight?
Part D
Long Answers
Note: Answers any ten questions.
Q.1a: State Newton’s three laws of motion, giving example from everyday life.
Q.1b: Which object has the greater momentum (a. an object A of 45 kg moving at 3m/s or (b. an
object B of mass 3kg moving at 45m/s?
Q.2a: What is Friction? And define its types. Define methods of reducing Friction.
Q.2b: A piece of wood weighing 225N is paced on a horizontal pane. How much force is required
to set this piece in motion? (Co-efficient of friction is 0.4.
Q.3a: What is Tension? Derive the expressions for Tension and Acceleration of body moving in a
string when both move vertically.
Q.3b: A ball is dropped from a height of 114 m. How much time will it take to reach the ground?