# Physics Questions and Answers - Form 2 Mid-term Exams Term 1 2022

## QUESTIONS

1. State basic law of magnetism (1mks)
2. Give a reason why a concrete beam reinforced with steel does not crack when subjected to change in temperature (1mks)
3. Name two adaptations that can be made to a mercury thermometer to make it more sensitive (2mks)
4. An oil drop of average diameter 0.7mm spreads out into a circular patch of diameter 75cm on the surface of water in a trough.
1. Calculate the average thickness of a molecule of oil (3mks)
2. State two assumptions made in (i) above (2mks)
5. A block measuring 20cm x 10cm x 5cm rests on a flat surface. A block has a weight of 3N. determine the maximum pressure it exerts on the surface. (3mks)
6. A Vanier calipers shown below have a zero error of -0.06cm.(6mks)

State the actual reading on the instrument (2mks)
7. State two ways in which stability of a body can be increased (2mks)
8. 200 coulombs of charge passes through a point in a circuit for 0.6 minutes. What is the magnitude of current flowing? (2mks)
9. Distinguish between hard magnetic material and a soft magnetic material (2mks)
10. A coil of insulated wire is wound around a U – shaped soft iron core XY and connected to a battery as shown in the figure below

State the polarities of ends X and Y (2mks)
X ………………………………
Y ………………………………
11. Define moment of a force and state its SI unit (2mks)
12. Express each of the following number in standard form (3mks)
1. 201
2. 2670
3. 0.0000009047
13. What is the reading of the micrometer screw gauge in the figure below. (3mks)

## MARKING SCHEME

1. State basic law of magnetism (1mks)
like polar repel while unlike poles attract
2. Give a reason why a concrete beam reinforced with steel does not crack when subjected to change in temperature (1mks)
steel and concrete have the same linear expansivities
3. Name two adaptations that can be made to a mercury thermometer to make it more sensitive (2mks)
the walls of the bulb should be very thin
the capillary tube should be very thin and have uniform x-section area
4. An oil drop of average diameter 0.7mm spreads out into a circular patch of diameter 75cm on the surface of water in a trough.
1. Calculate the average thickness of a molecule of oil (3mks)
thickness  = volume/area
= 4/3 π83
π82
4/3 × 22/7 × 0.35 × 0.35 × 0.35
22/7 × 375  × 375
= 4065 × 10-7 mm
2. State two assumptions made in (i) above (2mks)
the oil drop is a perfect sphere
the patch is metric large
5. A block measuring 20cm x 10cm x 5cm rests on a flat surface. A block has a weight of 3N. determine the maximum pressure it exerts on the surface. (3mks)

6. A Vanier calipers shown below have a zero error of -0.06cm.(6mks)

State the actual reading on the instrument (2mks)
actual reading  = 3.31 + 0.06cm
7. State two ways in which stability of a body can be increased (2mks)
increase the base area
lower the C.O.G
8. 200 coulombs of charge passes through a point in a circuit for 0.6 minutes. What is the magnitude of current flowing? (2mks)
9. Distinguish between hard magnetic material and a soft magnetic material (2mks)
10. A coil of insulated wire is wound around a U – shaped soft iron core XY and connected to a battery as shown in the figure below

State the polarities of ends X and Y (2mks)
X ……North………
Y ……South……………
11. Define moment of a force and state its SI unit (2mks)
Turning effect of a force
Newton-metre (Nm)
12. Express each of the following number in standard form (3mks)
1. 201 - 2.01 × 102
2. 2670 - 2.6 × 103
3. 0.0000009047  - 9.047 × 10-7
13. What is the reading of the micrometer screw gauge in the figure below. (3mks)

thimble scale =
0.48n
19.48 mm

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