201.What is the dimension for velocity?
202.A car moving with a velocity of 20m/s at 30⁰ to the horizontal, what is the components of the velocity along the horizontal
- A. 17.3m/s
- B. 10m/s
- C. 20m/s
- D. 21m/s
203.If a moving car X collides head-on with a moving car Y in the opposite direction, the conservation of momentum states that
- A. The final momentum of X= final momentum of Y
- B. Total movement of X and Y is reversed
- C. Total momentum of X and Y stays constants
- D. Initial and final momentum of X is the same
204.A bullet of mass 20g travelling horizontally at 100m/s embeds it self in the centre of a block of wood 1kg which is suspended by light vertical string 1m, calculate the velocity
- A. V²=51/100m/s
- B. V²=100/51m/s
- C. V²=101/50m/s
- D. V²=21/50m/s
205.Starting from rest, a car of mass 1000kg accelerates steadily to 20m/s in 10s. What is the average power developed?
- A. 0.2kw
- B. 4.0kw
- C. 10kw
- D. 20kw
206.A body weighing 80N stands in an elevator that is about to move. The force exerted by the floor on the body as the elevator moves upward with an acceleration of 5ms⁻²
- A. 40N
- B. 80N
- C. 120N
- D. 160N
207.Which of the following pairs has one vector and one scalar quantity?
- A. Displacement, acceleration
- B. Potential energy, work
- C. Speed, power
- D. Kinetic energy, force
208.If 'P' is the momentum of an object of 'mass' m, then the expression P²/2m has the same units as
- A. Acceleration
- B. Energy
- C. Force
- D. Impulse
209.A ship floating in clear water of density 1000kg moves to sea water of density 1050kg where it floats, the upthrust on the ship then
- A. Stays constant
- B. Decreases
- C. Increases
- D. Increases by 0.05 times
210.In Coulomb’s law, the force between two point charges is proportional to; (1) The square of the distance between them,(2) Product of charges,(3) Permittivity of the medium
- A. 1 and 2
- B. 1 and 3
- C. 2 and 3
- D. 1 only
211.Two equal charges 1C separated in air by distance 1km. What would be the force between them?
- A. 2KN
- B. 3KN
- C. 9KN
- D. 10KN
212.A wheel and axle is used to raise a load of 500N by the application of an effort of 250N. If the radii of the wheel and the axle are 0.4cm and 0.1cm respectively, the efficiency of the machine is
213.A steady current of 0.5A flows through a wire, how much charge passes through the wire in one minute?
214.The main evidence that light rays travel in a straight line is that; (1) Incident, reflected and the normal lie in the same plane,(2) Pin-hole camera, (3) Eclipse of the sun, (4) Divergence of light rays
- A. 1 only
- B. 2 only
- C. 3 only
- D. 1, 2, and 3 only
215.Determine the potential difference between each ends of a wire of resistance 5 Ω; if 720C passes through it per minute
216.For an AC circuit at resonance it means
- A. XL=XC
- B. X=L
- C. R=C
- D. Z=R-C
217.Which of the followings are the characteristics of light rays (1).Reflection,(2).Refraction,(3).Dispersion,(4).Condition,(5).Chromination,
- A. 1 and 2
- B. 1 and 3
- C. 2 and 3
- D. 1, 2 and 3
218.The two commonly used lenses in an Astronomical telescope are:
- A. Objective, diverging
- B. Eye-piece, covering
- C. Objective, eye-piece
- D. Objective, converging
219.In dispersion of light rays which is odd out of the followings:(1)It involves separation of colours (2) Separation is due to differences in speeds (3) All colours travel with the same speed in vacuum (4)No speed is involved
- A. 1 only
- B. 2 only
- C. 3 only
- D. 1, 2 and 3
220.Sound waves and light waves cannot both be
- A. Refracted
- B. Reflected
- C. Made to produce an interference
- D. Polarised