A bat emits a sound wave at a speed of 1650.0ms-1 and receives the echoes 0.15s later. Calculate the distance of the bat from the reflector
- A. 8.75m
- B. 16.50m
- C. 87.75m
- D. 123.75m
- E. 330.00m
When the direction of vibration of the particles of a medium is perpendicular to the direction of travel of a wave the wave transmitted is known as
- A. sound wave
- B. transverse wave
- C. longitudinal wave
- D. stationary wave
- E. mechanical wave
Which of the following is not a suitable method for reducing loss of heat from a piece of hot iron?
- A. Wrapping it in cotton wool
- B. painting it black
- C. Placing it in a vacuum
- D. Placing it on rubber supports
- E. Keeping it in a closed wooden box
Heat transfer by convection in a liquid is due to the
- A. translatory motion of the molecules of the liquid
- B. increased vibration of the molecules of the liquid about their mean positions
- C. expansion of the liquid as it is heated
- D. latent heat of vaporization of the liquid
- E. ability of the liquid to evaporate at all temperatures
How much heat is given out when a piece of iron of mass 50g and specific heat capacity 460 Jkg-1k-1 cools from 85oC to 25oC?
- A. 1.38 x 106 J
- B. 2.53x104J
- C. 7.66x103J
- D. 1.38x103J
- E. 1.27 X103J
lf the temperature of a small quantity of water in a closed container is gradually increased from 0o to 40oC then the density of the water within this range
- A. increases for a while and then decreases
- B. decreases for a while and then increases
- C. increases gradually
- D. decreases gradually
- E. remains the same
Two solids P and Q of equal mass are heated to the same temperature and dropped simultaneously into two identical containers X and Y containing equal volumes of water at room temperature. The temperature of X will rise higher than that of Y only if the
- A. volume of P is greater than that of Q
- B. specific heat capacity of P is higher than that of Q
- C. density of P is greater than that of Q
- D. density of P is lower than that of Q
- E. specitic heat capacity of P is lower than that of Q.
Dry hydrogen is trapped by pellet of mercury in a uniform capillary tube closed at one end. If the length of the column of hydrogen at 27°C is 1.0m, at what temperature will the length be 1.20m?
- A. 22.5oC
- B. 32.4oC
- C. 77.0oC
- D. 87.0oC
- E. 360.0oC
A cube made of a metal of linear expansivity is warmed through a temperature of t. lf the initial volume of the cube is V what is the increase in volume of the cube?
- A. 1/3α Vt
- B. 1/2α Vt
- C. α Vt
- D. 2α Vt
- E. 3α Vt
The absolute zero temperature is defined as the temperature at which
- A. thermal motion ceases
- B. the temperature of a gas is 273oC
- C. ice melts
- D. the volume of a real gas is maximum
- E. the pressure of a real gas is maximum
An object weighs 10.0 N in air and 7.0 N in water. What is its weight when immersed in a liquid of relative density 1.5?
- A. 4.50N
- B. 4.67N
- C. 5.50N
- D. 6.67N
- E. 8.50N
The body P shown in the diagram above is in equilibrium. If the mass Q of the body is 10kg, calculate the tension T in the string. (Take g = 10ms2)
- A. 20/√3N
- B. 20N
- C. 50N
- D. 200√3N
- E. 200N
A simple pendulum makes 50 oscillations in one minute. What is its period of oscillation?
- A. 0.02s
- B. 0.20s
- C. 0.83s
- D. 1.20s
- E. 50.00s
An object R leaves a platform XY with a horizontal velocity of 7m-1 and lands at Q. lf it takes the same object 0.3s to fall freely from Y to P, calculate the distance PQ.(Take g = 1Oms2)
- A. 7.30m
- B. 2.55m
- C. 2.10m
- D. 1.65m
- E. 0.45m.
A force F is applied to a body P as shown in the diagram above. If the body P moves through a distance r, which of the following represents the work done?
- A. Fx
- B. Fcosθ/x
- C. Fx tanθ
- D. Fx sinθ
- E. Fx cosθ
Two forces each of 4 N act on the opposite sides of a rectangular plate as shown in the diagram above. Calculate the magnitude of g the couple acting on the plate.
- A. 6.4 Nm
- B. 3.2 Nm
- C. 1.6 Nm
- D. 0.8 Nm
- E. 0.0 Nm
A girl whose mass is 55kg stands on a spring – weighing machine inside a lift. When the lift starts to ascend, its acceleration is 2ms1. What will be the reading on the machine? (Take g = ms-2)
- A. 66 kg
- B. 55 kg
- C. 44 kg
- D. 22 kg
- E. 11 kg
The diagram above represents a portion of a micrometer screw 20 gauge. What is its reading?
- A. 3.70mm
- B. 3.67mm
- C. 3.50mm
- D. 3.33mm
- E. 3.17mm
A plane inclined at an angle at 30o to the horizontal has an efficiency of 50%. The force parallel to the plane required to push a load of 120 N uniformly up the plane is
- A. 40√3N
- B. 60N
- C. 120N
- D. 200N
- E. 240N
Which of the following are contact forces? I. Force of tension II. Force of fiction, III. Magnetic force III Force of reaction.
- A. I,II and III only
- B. I, II and IV only
- C. I, III and IV only
- D. II, III and IV only
- E. l and IV only.
An oscillating pendulum has a velocity of 2ms-1 at the equilibrium position O and velocity at same point P. Using the diagram above, calculate the height of P above O. (Take g = 10ms2)
- A. 5.0m
- B. 2.0m
- C. 0.4m
- D. 0.2m
- E. 0.1m