A body of mass 100g moving with a velocity of 10ms-1 collides with a wall. If after collision it moves with a velocity of 2.0ms−1 in the opposite direction, calculate the change in momentum.
- A. 0.8Ns
- B. 1.2Ns
- C. 12.0Ns
- D. 80.0Ns
The force between the molecules of a liquid in contact with that of a solid is?
- A. Adhesive
- B. Cohesive
- C. Magnetic
- D. Repulsive
A ball of mass 800g moving horizontally with a speed of 5m/s hits a vertical wall and rebounds with the same speed. The impulse experienced by the ball is?
- A. 0kgm
- B. 2kgm/s
- C. 4kgm/s
- D. 8kgm/s
When an atom loses or gain a charge it becomes
- A. An electron
- B. An ion
- C. A neutron
- D. A proton
A pulley system has three pulleys in the fixed block and two in the movable block and if the pulley has an efficiency of 72%, the mechanical advantage of the system is?
- A. 36.0
- B. 7.2
- C. 5.0
- D. 3.6
The inner diameter of a small test tube can be measured accurately using a
- A. Micrometres screw gauge
- B. Pair of dividers
- C. Metre rule
- D. Pair of vernier calliper
Calculate the effective capacitance of the circuit in the diagram given
- A. 4μf
- B. 3μf
- C. 2μf
- D. 1μf
What effort will a machine of efficiency 90% apply to a load of 180N if its efforts arm is twice as long as its load arm?
- A. 100N
- B. 90N
- C. 80N
- D. 120N
An object moves in a circular path of radius 0.5m with a speed of 1ms\(^{-1}\). What is its angular velocity?
- A. 8rads\(^{-1}\)
- B. 4rads\(^{-1}\)
- C. 1rads\(^{-1}\)
- D. 2rads\(^{-1}\)
In homes, electrical appliances and lamps are connected in parallel because
- A. less current will be used
- B. less voltage will be used
- C. parallel connection does not heat up the wires
- D. series connection uses high voltage
In the diagram shown, If the south-poles of two magnets stroke a steel bar, the polarities at T and V will respectively be
- A. north and south
- B. south and south
- C. north and north
- D. south and north
Musical instruments playing the same note can be distinguished from one another owing to the difference in their
- A. quality
- B. pitch
- C. intensity
- D. loudness
Convex mirrors are used as driving mirrors because images formed are
- A. erect, Virtual and diminished
- B. erect, real and diminished
- C. erect, virtual and magnified
- D. inverted, virtual and diminished
The differences observed in solids, liquids and gases may be accounted for by
- A. their relative masses
- B. their melting points
- C. the spacing and forces acting between the molecules
- D. the different molecules in each of them
The process whereby a liquid turns spontaneously into vapour is called
- A. regelation
- B. evaporation
- C. boiling
- D. sublimation
Electrical appliances in homes are normally earthed so that
- A. a person touching the appliances is safe from electric shock
- B. both the a.c. and d.c. sources can be used
- C. the appliances are maintained at a higher pd than the earth
- D. the appliances are maintained at a lower pd than the earth
A positively charged rod X is brought near an uncharged metal sphere Y and is then touched by a finger with X still in place. When the finger is removed, the result is that Y has
- A. no charge and a zero potential
- B. a positive charge and a zero potential
- C. a negative charge and a positive potential
- D. a negative charge and a negative potential
The time rate of loss of heat by a body is proportional to the
- A. temperature of its surroundings
- B. temperature of the body
- C. difference in temperature between the body and its surroundings
- D. ratio of the temperature of the body to that of its surroundings
In the diagram shown, which of the simple pendulum will resonate with P when set into oscillation?
- A. U
- B. T
- C. R and T
- D. Q and R
If the fraction of the atoms of a radioactive material left after 120years is \(\frac{1}{64}\), what is the half-life of the material? \(\frac{1}{64}\)
- A. 20 years
- B. 10 years
- C. 2 years
- D. 24 years
In a series R-L-C circuit at resonance, the voltages across the resistor and the inductor are 30V and 40V respectively. What is the voltage across the capacitor?
- A. 30V
- B. 70V
- C. 50V
- D. 40V