# Physics Questions and Answers - Form 1 Term 2 Opener Exams 2023

## QUESTIONS

1.
1. Define masses and state its SI units. (2mks)
2. Name the instruments used to measure mass. (4mks?)
2. Distinguish between a basic physical quantity and a derived physical quantity giving an example of each case. (3mks)
3.
1. Define force and state its SI unit. (2mks)
2. State three effects of force when subject to an objects. (3mks)
3. List any three types of forces. (3mks)
4. Indicator on the diagram below, the level of the mercury in the tubes x ND Y
4.
1.  Differentiate between scalar and vector quantity. (2mks)
2. Give the resultant in each case.(4mks)
5.
1. Define pressure and state its SI unit. (2mks)
2.  A brick 210cm long, 10cm wide and 5cm thick has a mass of 500g. Determine the
1. Greatest pressure that can be exerted by the brick on a flat surface. (2mks)
2. Least pressure that can be exerted by the brick on a flat surface.(3mnks)
(Take g=10N/KG)
6.
1. State any four differences between mass and weight.(4mks)
2. A man has a mass of 70kg. Calculate:
1. His weight on earth, where the gravitational field strength is 10N/KG. (2mks)
2. His weight on the moon, where the gravitational field strength is 1.7N/kg.(2mks)
7.
1. A sphere of diameter 6.0cm is molded into a thin uniform wire of diameter 0.2mm. Calculate the length of the wire in meters. (take pie =3.14)
2. Find the volume of a triangular prism whose base is 6.0cm, height is 5.0 cm and length is 12.0cm.(3mks)
8. The diagram below shows a sketch of the map of Kenya, which is not drawn to scale.
If the area of small square is 2.0cm2. Calculate the area of the map. (5mks)
9. Laboratory is a special room where the practical is done and where they store apparatus. State 6 safety rules that one must observe. (6mks)
10. Convert each of the following in as indicated.
1. 10 tones into kg
2. 256g into kg
3. 1.25g into mg
11.
1. Define time and state its SI units. ( 2mks)
2. Convert the following
1. 24hrs into minutes
2. 360 seconds into hours
12.
1. Define physics. (2mks)
2. State and explain any two branches of physics.

## MARKING SCHEME

1.
1. Define masses and state its SI units. (2mks)
• mass of an object is the quantity of matter in it.
• SI unit is kilogram(kg)
2. Name the instruments used to measure mass. (4mks?)
• Top pan balance
• Beam balance
• Lever balance
2. Distinguish between a basic physical quantity and a derived physical quantity giving an example of each case. (3mks)
3.
1. Define force and state its SI unit. (2mks)
• force is push or a pull
• SI unit of force is newton.
2. State three effects of force when subject to an objects. (3mks)
• Slow down or stop a moving object.
• Change the direction of a moving object.
• Distort/change the shape of an object.
• Making stationary object start moving/increase the speed of a moving object.
3. List any three types of forces. (3mks)
• Gravitational
• Tension
• Up/thrust force
• Magnetic force
• Electrostatic force.
• Conceptual force
• Cohesive force
• Molecular force
• Nuclear force.
4. Judicator on the diagram below, the level of the mercury in the tubes x and Y
4.
1. Differentiate between scalar and vector quantity. (2mks)
2. Give the resuctant in each case.(4mks)
5.
1. Define pressure and state its SI unit. (2mks)
• pressure is the force acting normally(perpendicularly) per unit area.
• SI unit pascal/newton per square meter(N/M2)
2. A brick 210cm long, 10cm wide and 5cm thick has a mass of 500g. Determine the
1. Greatest pressure that can be exerted by the brick on a flat surface. (2mks)
• Pmax=f/asmallest
Force=500/1000 x10=5n
Area=0.10x0.05=0.005m2
5n/0.005m2=1000NM2
2. Least pressure that can be exerted by the brick on a flat surface.(3mks)
(Take g=10N/KG)
• Pleast=f/(area(large))=5/(0.20x0.10)=250n/m
6.
1. State any four differences between mass and weight.(4mks)
 Mass Weight It is quality of matter in a body. Is the pull of gravity on a body It is measured in kilogrammes It is measured in newtons It is the same everywhere. Changes from places to places Measured using beam balance Measured using spring balance Has magnitude only Has magnitude and direction
2. A man has a mass of 70kg. Calculate:
1. His weight on earth, where the gravitational field strength is 10N/KG. (2mks)
• W=mg
• 70x10=700n
2. His weight on the moon, where the gravitational field strength is 1.7N/kg.(2mks)
• W=mg
• 70x1.7=119n
7.
1. A sphere of diameter 6.0cm is moulded into a thin uniform wire of diameter 0.2mm. Calculate the length of the wire in meters. (take
2. Find the volume of a triangular prism whose base is 6.0cm, height is 5.0 cm and length is 12.0cm.(3mks)
8. The diagram below shows a sketch of the map of Kenya, which is not drawn to scale. If the area of small square is 2.0cm2. Calculate the area of the map. (5mks)
9. Laboratory is a special room where the practical is done and where they store apparatus. State 6 safety rules that one must observe. (6mks)
• Any correct, rule award 1mk each
10. Convert each of the following in as indicated.
1. 10 tones into kg
• 10x1000=10000kg
2. 256g into kg
• 256/1000 x0.256kg=0.256kg
3. 1.25g into mg
• 1.25gx1000=1250 mg
11.
1. Define time and state its SI units. ( 2mks)
• Time is a measure of duration of an event.
• SI unit-second
2. Convert the following
1. 24hrs into minutes
• 24x60=1440 munites
2. 360 seconds into hours
• 3600/60x60 1hr
12.
1. Define physics. (2mks)
2. State and explain any two branches of physics.
• Mechanis,electrically and magnetism, thermodynamics geometrical optic wave, atomic
• Award 1mark for stating and 1 mark for explaining

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