PHYSICS PAPER ONE- 1988

Which of the following subtances is not elastic?
1. Glass
2. Rubber
3. Plasticine
4. Copper
A bus carrying a heavy load on it's rack is more unstable when moving because
1. its centre of gravity is raised
2. the fricition on the ground increases
3. its total weight is increased
4. its pressure on the tyres is increased
The senstivity of a thermometre can be increased by
1. increasing the volume of the bulb
2. increasing the amount of liquid in the thermometer
3. decreasing the thickness of the stem wall
4. decreasing the diameter of the bore of the capillary tube
When a body in stable equilbrium is tilted slightly
1. the positon of its center of gravity is lowered
2. the positon of its center of gravity is raised
3. the positon of its center of gravity does not change
4. it topples over
A flywheel connected to an internal combustion engine is made heavy in order to
1. store rotational kinetic energy
2. store kinetic energy
3. produce a spark
4. help valves to open at regular intervals
A bullet of mass 150g is fired with a seed of 400ms^-1.The rifle recoils with a speed of 10ms^-1.Find the mass of the rifle
1. 60.0kg
2. 6.0kg
3. 3.0kg
4. 0.6kg
Which one of the following equations does not represent the expression for power P, in terms of voltage V,current I, and resistance R?
1. P=VI
2. P=I²R
3. P=V²/R
4. P=R²/I
A parachute released from an aeroplane will fall with constant velocity when
1. its weight is equal to the upthrust
2. its weight is equal to the air resistance
3. the air resistance is equal to the upthrust
4. the upthrust plus the air resistance are equal to its weight
In metals heat is transmitted by
1. conduction and radiation
2. convection and radiation
3. conduction only
4. convection only
Calculate the pressure exerted on the road by a car of mass 740kg if the area of contact between the road and each of the four tyres is 50 cm²
1. 37Nm^-2
2. 3.7 x10⁴ Nm^-2
3. 3.7 x10⁵ Nm^-2
4. 1.48x10⁶Nm^-2
A high voltage d.c may be obtained from a low voltage d.c by the use of
1. a dynamo
2. an induction coil
3. a generator
4. a transformer
The mass of a radioactive substance falls to 1/4 of its original mass after 10 days.What is its half life?
1. 2.5 days
2. 5 days
3. 20 days
4. 40 days
Which one of the following controls the brightness of a spot on the screen of a cathode ray oscilloscope?
1. X-plates
2. Y-plates
3. The grid
4. The anode
A beam of white light is to be passed through a combination of two filters. Which filter combination will allow only red light?
1. Blue and red filters
2. Cyan and red filters
3. Yellow and magenta filters
4. Cyan and magenta filters
When liquid is heated
1. its molecules move with the same speed
2. its density decreases
3. evaporation takes place throughout the liquid
4. boiling occurs at all temperatures
How much energy is required to melt 2kg of ice at 0⁰ celicius?
1. 0 KJ
2. 167 KJ
3. 334 KJ
4. 668 KJ
An electric motor is connected by a cable to a 240 V supply.The p.d across the motor is 239 V when the current flowing is 5A.The resistance of the cable is
1. 0.2 Ω
2. 5 Ω
3. 47.8 Ω
4. 48 Ω
Which of the following is not true about a vacuum flask?
1. it controls loss of heat by radiation using the vacuum
2. it can be used to keep the cold liquids cold
3. the cork is used to reduce loss of heat by convection
4. the silvering of the walls on the vacuum side reduces loss or gain of heat by radiation
Which of the following is the correct order of energy changes at the hydro electric power station?
1. kinectic→ potential →electrical
2. potential→ kineic →electrical
3. potential→ heat →electrical
4. heat→ potential →electrical
In a four stroke internal combustion engine the work required for initial induction and compression comes from
1. the rotational kinetic energy stored in the flywheel
2. the movement of his steering wheel
3. the seperate starter motor
4. the sparking plug

PHYSICS PAPER ONE- 1988

Quiz