A ray of light strikes a plane mirror at an angle of incidence i. Determine in terms of i the angle of deviation of the ray after reflection from the mirror.
- A. i
- B. 2i
- C. 90o-i
- D. 90o+ i
- E. 180o - 2i
A metal of mass 1.5 kg was heated from 27oC to 47oC in 4 minutes by a boiling ring of 75 W rating. Calculate the specific heat capacity of the metal, (Neglect heat losses to the surrounding)
- A. 2.5 X103J kg-10C-1
- B. 6.0 X102J kg-10C-1
- C. 2.5 x 102J kg-10C-1
- D. 1.4 X102J kg-10C-1
- E. 1.0 x 102J kg-10C-1
Which of the following instruments is used to measure relative humidity?
- A. Hydrometer
- B. Barometer
- C. Manometer
- D. Hypsometer
- E. Hygrometer
A small circular membrane is 10cm below the surface of a pool of mercury when the barometric height is 76 cm of mercury. If the density of mercury is 13600\(kgm^{-3}\), what is the pressure on the membrane in \(Nm^{-2}\)? \((g =10ms^{-2})\)
- A. 1.17 x 107 Nm-2
- B. 6.80 x 105Nm-2
- C. 1.17x105Nm-2
- D. 1.03 x 105Nm-2
- E. 1.36 x104 Nm-2
Which of the following best explains why a person suffers a more severe burn when his skin is exposed to steam than when boiling water pours on his skin?
- A. Steam is at a higher temperature than boiling water
- B. Steam possesses greater heat energy per unit mass than boiling water
- C. Steam spreads more easily over a wider area of the skin man boiling water
- D. Steam penetrates more deeply into the skin than boiling water
- E. the specific latent heat of vaporization is released in changing from boiling water to steam
A gas which obeys Charles’ law exactly has a volume of 283cm3 at 10oC. What is its volume at 30oC?
- A. 142cm3
- B. 293cm3
- C. 303cm3
- D. 566cm3
- E. 849cm3
Which of the following colours of surfaces will radiate heat energy best?
- A. Red
- B. White
- C. Black
- D. Yellow
- E. Blue
A given mass of gas at a temperature of 30°C is trapped in a tube of volume V. Calculate the temperature of the gas when the volume is reduced to two-third of its original value by applying a pressure twice the original value.
- A. 71oC
- B. 40oC
- C. 131oC
- D. 313oC
- E. 404oC
Which of the following statements is/are correct? I. Pure water freezes at 0oC under normal pressure ll. Water has its highest density at 4oC. III. The volume at 4oC,
- A. I only
- B. II only
- C. I and II only
- D. I and III only
- E. II and III only
Steel bars, each of length 3.0 m at 28°C, are to be used for constructing a rail line. If the linear expansivity of steel is 1.0 x 10-5°C, what is the safety gap that must be left between successive bars if the highest temperature expected is 40oC?
- A. 1.2 x 10-1cm
- B. 8.4 x 10-2cm
- C. 7.2 x10-2cm
- D. 3.6 x 10-2cm
- E. 1.8 x 10-2cm
A body of mass 5kg falls from a height of 10m above the ground. What is the kinetic energy of the body just before it strikes the ground? (Neglect energy losses and take gravity as 10ms^2)
- A. 5J
- B. 25J
- C. 250J
- D. 500J
- E. 625J
A barometer can be used in determining the I. height of a mountain II. depth of a mine III. dew point. Which of the following is/are correct?
- A. I, II and III
- B. II and III only
- C. I and III only
- D. I and II only
- E. III only
A force of 20 N applied parallel to the surface of a horizontal table, is just sufficient to make a block of mass 4kg move on the table. Calculate the coefficient of friction between the block and the table. (g = 10ms2)
- A. 0.05
- B. 0.20
- C. 0.50
- D. 0.80
- E. 2.00
Which of the following will reduce the frequency of oscillation of a simple pendulum?
- A. Increasing the mass of the bob
- B. Decreasing the mass of the bob
- C. Increasing the length of the string
- D. Decreasing the length of the string
- E. Increasing the amplitude of oscillation
Solid weighs 0.040 N in air and 0.024 N when fully immersed in a liquid of density 800 kg m-3. What is the volume of the solid? (g = 1Oms2)
- A. 2.0 x 10-6m3
- B. 2.5x10-6m3
- C. 3.0x10-6m3
- D. 2.0x 10-5m3
- E. 3.0 x 10-5m3
Which of the following has the same unit as the moment of a force?
- A. Force
- B. Power
- C. Work
- D. Momentum
- E. Impulse
A body accelerates uniformly from rest at the rate of 3 m/s\(^2\) for 8 seconds. Calculate the distance covered by the body during the acceleration?
- A. 12m
- B. 24m
- C. 48m
- D. 72m
- E. 96m
Which of the following statements about solid friction is/are correct? I. Friction depends on the nature of the surfaces in contact II. Friction depends on the area of contact III. Friction always acts in the direction of motion.
- A. I only
- B. II only
- C. III only
- D. I and II only
- E. I,II and III
What change in velocity would be produced on a body of mass 4kg if a constant force of 16 N acts on it for2 s?
- A. 0.5 ms-1
- B. 2.0ms-1
- C. 8.0 ms-1
- D. 32.0 ms-1
- E. 128.0 ms-1
The diagram above represents the trajectory of a projectile with an initial velocity U. Calculate the time taken to reach the maximum height. (Take g as acceleration due to gravity)
- A. Usinθ/2g
- B. 2Usinθ/g
- C. Ucosθ/g
- D. 2Ucosθ/g
- E. Usinθ/g
Which of the following is a scalar quantity?
- A. Momentum
- B. Acceleration
- C. Displacement
- D. Distance
- E. Force