Second Term Examination Physics SS 1 Second Term Lesson Notes

SECOND TERM EXAMINATION

Subject: PHYSICS Class: SS1 Time:2hrs

Section A: Objective

Instruction: Answer all question in this section.

1. The time rate of increase in velocity is called (A) force (B) momentum (C) acceleration (D) speed
2. Which of the following quantities is a vector? (A) volume (B) momentum (C) energy (D) speed
3. In a elastic collision, momentum is conserved as well as (A) velocity (B) kinetic energy (C) potential energy (D) speed
4. The included current in a coil always flow in a direction so as to oppose the change that causes it. This statement is known as (A) coulomb’s law (B) faraday’s law (C) lenz’s law (D) ampere’s law
5. Which of the following instrument can be used to compare the magnitudes of charges on two given bodies? (A) electrophorus (B) ebonite rod (C) gold leaf electroscope (D) proof planes
6. A body of mass 2kg is released from a point of 100m above the ground. Calculate its kinetic energy 80m from the point of release (A) 1600 j (B) 900 j (C) 600 j (D) 200 j
7. Which of the following waves is mechanical (A) waves in pipes (B) water waves (C) radio waves (D) sound waves
8. A loaded spring is set is simple harmonic motion. The force that tends to restore the load to its equilibrium position is (A) adhesive (B) elastic (C) frictional (D) gravitational
9. Which of the following cases cannot produce total internal reflection? A light ray travelling from (A) glass to water (B) kerosene to air (C) air to water (D) water to ice
10. The vacuum in thermo flask reduces heat loss resulting from (A) radiation only (B) conduction and convection only (C) radiation and convection only (D) conduction only
11. In which of the following media is speed sound the least? (A) air (B) brass (C) water (D) wood
12. Which of the following materials does not serve as a safety device in electrical circuits (A) connecting wires (B) earth wire (C) fuse (D) switch
13. Which of the following liquids has the highest surface tension (A) soapy water (B) cold water (C) hot water (D) oily water
14. An instrument used to measure relative humidity is the (A) hygrometer (B) hydrometer (C) pyrometer (D) manometer
15. The area under velocity time graph represents (A) speed (B) acceleration (C) moment (D) distance
16. Which of the following properties is not exhibited by sound waves (A) diffraction (B) polarization (C) interference (D) reflection
17. When ultraviolent light is incident on certain metallic surfaces particles are emitted, these particles are called (A) positrons (B) protons (C) photoelectrons (D) photons
18. Which of the following statement is the correct reason for using soft iron in armature of an electric bell? (A) it is a diamagnetic material (B) its losses its magnetism readily (C) it is not easily magnetized (D) it retains its magnetism for a long time
19. A transverse pulse of frequency 9 Hz travels 4.5 m in 0.6s. Calculate the wavelength of the pulse (A) 3.33m (B) 0.83m (C) 0.30m (D) 1.20m
20. The S.I unit of sound of energy is (A) HZ (B) cb (C) Db (D) J.

THEORY

Answer all

1. A car start from rest and accelerates uniformly until its reach a velocity of 30ms^—1 after 5s. It travels with uniform velocity for 15s and is then brought to rest in 10s with a uniform retardation. Determine;
2. The acceleration of the car
3. The retardation
4. The distance covered after 5s
5. The total distance covered

B. A moves from rest with an acceleration of 0.2ms^—2 . Find its velocity when it has moved a distance of 50m

C. Define the following parameters use to describe motion on a straight line. i. Displacement ii. Uniform velocity iii. Acceleration

1. A body is projected horizontally from the top of a vertical cliff 40m high, with a velocity of 20ms. Calculate; a. The time taken for the body to fall on the ground

b. The vertical component of the velocity when the body hits the ground

c. The distance from the cliff when its strikes the ground

B. A ball is thrown up vertically with a velocity of 40ams^—1 . Calculate; a. Maximum height reached b. time to reach the maximum height c. Time to reach the ground again

1. Define work

b. A body is pulled along a horizontal plane by a constant force of 10N parallel to the plane.

a. Calculate the work done in moving the body a distance of 20m

b. What work has been done if the same force is used on the body for the same distance but applied in a direction making an angle 60⁰ to the horizontal

1. Explain “work done in a force field”

SECOND TERM EXAMINATION

Subject: PHYSICS Class: SS2 Time:2hrs

1. A ball falling through a viscous liquid is acted upon by (A) up thrust only (B) up thrust and the ball’s weight (C) the ball’s weight and viscous force (D) up thrust, the ball’s weight , and viscous force
2. When an elastic material is stretched by a force the energy stored in its is (A) kinetic (B) potential (C) thermal (D) electrical
3. When the linear momentum of a body is constant, the net force of acting on it is (A) zero (B) increases (C) decreases (D) remains constant
4. Which of the following pairs of physical quantities is made up of vectors? (A) speed and displacement (B) mass and force (C) displacement and acceleration (D) momentum and length
5. The knowledge of surface tension is applied in the following area except in (A) manufacturing of rain coats (B) production of palm oil (C) floating of needle in water (D) washing of plate in soapy water
6. Heat transfer by conduction is similar to wave motion because (A) there is increase in temperature (B) transfer of materials is involved (C) charged particles vibrate at right angle (D) no transfer of materials is involved
7. The temperature at which the water vapor in the air saturates the air and begins to condense is known as (A) dew point (B) critical point (C) boiling point (D) triple point
8. The quality of a note depends on its (A) frequency (B) pitch (C) overtones (D) amplitude
9. A transverse weave can be distinguished from a longitudinal wave by (A) diffraction (B) reflection (C) refraction (D) polarization
10. The super position of waves to produce maximum or zero effect at a point is known as (A) reflection (B) refraction (C) interference (D) diffraction
11. The energy stored in a simple cell is (A) electrical (B) nuclear (C) thermal (D) chemical
12. The energy required to separate the nucleus in an atom completely is known as (A) mass defect of an atom (B) electron biding energy (C) excitation energy (D) nuclear binding energy
13. Which of the following statements is the major advantage of nuclear fussion over nuclear fission (A) nuclear fusion releases more energy (B) more neutrons are released in fusion than in fission (C) fusion does not release as much dangerous radiation as fission (D) fusion reactions occour more readily than fission
14. Materials that can be stretched and still return to their original forms when the stresses are removed are said to be (A) elastic (B) elastomer (C) plastic (D) thermoplastic
15. When the surface of a piece of chalk is scrapped the tiny particles that flake off are known as (A) matter (B) molecules (C) elements (D) atoms
16. The region around a magnet in which the magnetic influence is experienced is called (A) magnetic flux (B) magnetic field (C) magnetic meridian (D) magnetic declination
17. A device used to prevent wearing away of the make and break contacts of an induction coil is called a (A) fuse (B) electroscope (C) resistor (D) capacitor
18. In which of the following media does sound travel fastest? (A) water (B) brass (C) air (D) wood
19. Loudness increases as a vibrating tuning fork is brought nearer the end of a pipe containing air column due to (A) resonance (B) echo (C) reverberation (D) diffraction
20. Which of the following physical process cannot be explained by the molecular theory of matter? (A) evaporation (B) thermal conduction (C) radiation of heat (D) convectional current in fluids

THEORY

Answer all

1. Define “moment of a force” and ‘couples”

ii. Explain the turning effect of a force

iii. State the principle of moment

B. State the Archimedes principle and principle of floatation

1. A light (weightless) bar is pointed at its center and weight of 5N and 10N, placed 3M and 2M respectively from the point on one side, are balanced by a weight of 20N on the other side. How bfar is the 20N weight from the point?

b. Explain center of gravity

ii. A basket full of water and weighing 200N is supported by two men holding the handle at each side, each pulling side ways at an angle of 30⁰ to the vertical. Find the force in each man’s arm

1. A body of mass 3kg is suspended by an inextensible string from a nail 0 and is pulled by a horizontal force F until the angle of inclination of the string to the vertical is 30⁰ . calculate the value of F and the tension in string (Take g = 10ms^—2 , tan30 =

b. A uniform beam 6.0m and weighing 4kg rest on supports P and Q placed left and right 1.0 meter from each and of the beam. Weights of mass 10kg and 8kg are placed near p and Q respectively. Calculate the reactions at P and Q

1. Define machine
2. Explain the following i. Mechanical advantage ii. Velocity ratio iii. Efficiency

B. The velocity ratio of a machine is 5 it is used to raise a load of 400N through a height of 10m. If the work done against fiction is 1000j, calculate;

i. Work done by the effort

ii. Efficiency

iii .Effort