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Test # Mid term
Time: 2 hours
Physics
Class: 09
th
Chapters (01, 02, 03, 04)
Dated: ____/____/_______
Student Name:
Roll No:
Marks: 60
Objective
Q.1: Fill the best option 01 Î§ 12 = 12
1. If the moment arm is greater than the moment of force will be
Lesser
b
greater
c
same
d
None of these
2. In isolated system, the momentum of two bodies will be:
increased
b
Zero
c
Constant
d
Both (B) & (C)
3. When horse pulls a cart, the action is on the?
Earth
b
Cart
c
Horse
d
Earth and cart
4. The least count of digital vernier caliper is
0.001cm
b
0.01cm
c
0.1cm
d
0.1mm
5. Coefficient of friction between wood and concrete is
0.8
b
0.9
c
0.2
d
0.62
6. Standard form of 6400 km is
64 Î§ 10
2
km
b
64 Î§ 10
3
km
c
64 Î§ 10
-2
km
d
64 Î§ 10
-3
km
7. Rate of change of momentum is equal to;
torque
b
work
c
distance
d
force
8. What will be the magnitude of resultant force, if F
x
= 3N and F
y
= 4N
5 N
b
7 N
c
12 N
d
10 N
9. The number of forces that can be added by head to tail rule are;
3
b
2
c
4
d
Any number
10. The center of gravity of a uniform square sheet is the point of
Edge
b
base
c
Intersection of
diagonal
d
Intersection of its
medians
11. A moving fan satisfy the â€¦â€¦â€¦â€¦â€¦..of equilibrium
2
nd
condition
b
1
st
condition
c
Both (a) & (b)
d
None of these
12. The efficiency of an electric motor is;
55 %
b
25 %
c
80 %
d
3 %
â€¦â€¦â€¦â€¦â€¦â€¦â€¦â€¦â€¦â€¦â€¦â€¦â€¦â€¦â€¦â€¦â€¦â€¦â€¦â€¦.
1
2
3
4
5
6
7
8
9
10
11
12
A
B
C
D
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Subjective
(Part-1)
Q.2: Write short answers of any 05 following questions 02 Î§ 05 = 10
1. What is head to tail rule?
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2. Think of a body which is at rest but not in equilibrium.
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3. State the principle of moments?
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4. Define translator motion also write its types.
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5. What is rigid body and plumb line?
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6. Differentiate between base and derived units.
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7. Estimate your 14 years age in seconds.
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8. Differentiate between positive zero error and negative zero error.
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Q.3: Write short answers of any 05 following questions 02 Î§ 05 = 10
1. The weight of a body is 147 N. What is its mass (where g= 10 ms-2)
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2. Why friction opposes motion?
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3. State Newtonâ€™s first law of motion.
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4. Define uniform speed and uniform velocity?
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5. Can a body moving at a constant speed have acceleration?
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6. Define acceleration and write its SI unit.
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7. Why is it dangerous to travel on the roof of a bus?
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8. Define least count. Write least count of screw gauge.
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Q.4: Write short answers of any 05 following questions 02 Î§ 05 = 10
1. Define the term velocity with SI unit.
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2. What is the law of conservation of momentum?
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3. Describe ways to reduce friction.
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4. Define the term velocity with SI unit.
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5. Differentiate Like and unlike parallel forces.
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6. Why rolling friction is less than sliding friction?
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7. Define torque. Also write S.I Unit with examples.
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8. When a body is said to be in equilibrium?
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(Part-2)
Note: Attempt ant two questions (2 Î§ 9 = 18)
Q.5: (a) Explain the states of equilibrium. 05
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(b) How much centripetal force is needed to make a body of mass 0.5 kg to
move in a circle of radius 50 cm with a speed 3ms
-1
. 04
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Q.6: (a) Drive the III equation of motion with the help of graph? 05
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(b) A train starts from rest with an acceleration of 0.5ms
-2
. Find its speed in kmh-
1, when it has moved through 100 m. 04
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Q.7: (a) State Newtonâ€™s second law of motion. Derive its mathematical formula. How
you can define Newton (N) using 2nd law of motion? 05
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(b) A Nut has been tightened a force of 200 N using 10cm long spanner what
length of a spanner is required to loosen the same nut with 150 N force. 04
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