The distance between two points in phase on a progressive wave is 5cm. If the sped of the wave is 0.2ms-1, calculate its period
- A. 4.00s
- B. 2.50s
- C. 0.25s
- D. 0.04s
Which of the following statements about a progressive mechanical wave is correct?
- A. it can be a plane polarised
- B. its energy is localised at specific points of its profile
- C. it does not require a material medium for its propagation
- D. its frequency remains constant as it travels between different media
The pressure exerted by a given mass of gas in a container
- A. decreases if the container is heated
- B. increases if the molecules of the gas move faster
- C. increases if the container is doubled
- D. decreases as the kinetic energy of the gas molecules inceases
Which of the following statements is correct?
- A. the density of a liquid decreases when it expands
- B. the density of a liquid increases when the liquids are heated
- C. the real expansivity of a liquid is less than its apparent expansivity
- D. a liquid changes to solid when heated to a sufficiently high temperature
Which of the following statements about boiling and evaporation at atmospheric pressure is correct?
- A. evaporation and boiling of water take place at 100o
- B. evaporation of water takes place at a temperature greater than 100oC, while boiling takes place at 100oC
- C. evaporation of water takes place at 100oC while boiling takes place at a higher temperature
- D. boiling takes place at 100o while evaporation my take place at temperatures lower than 100oC
The energy required to change a solid to liquid at constant temperature is called
- A. thermal capacity
- B. has lower specific heat capacity
- C. latent heat of fusion
- D. latent heat of vaporisation
Water falls through a height of 50m. Determine the temperature rise at the bottom of the fall. [Neglect energy losses. Specific heat capacity of water = 4200Jkg-1 K-1, g = 10ms2]
- A. 0.119oC
- B. 0.840oC
- C. 1.190oC
- D. 8.400oC
An immersion heater rated 400W, 220V is used to heat a liquid of mass 0.5kg. If the temperature of the liquid increases uniformly at the rate of 2.5oC per second, calculate the specific heat capacity of the liquid. [Assume no heat is lost]
- A. 1100Jkg-1K-1
- B. 320Jkg-1K-1
- C. 200Jkg-1K-1
- D. 176Jkg-1K-1
A body of mass m, has a specific heat capacity s, and a heat capacity c. If the temperature of the body changes by \(\theta^oC\), Which of the following equation is correct?
- A. ms\(\theta\) = mv-1
- B. ms = C
- C. ms = s\(\theta\)
- D. ms = c\(\theta\)
The lower and upper fixed point of a thermometer are 30mm and 180mm respectively. Calculate the temperature in degrees Celsius when the thermometer reads 45mm
- A. 10.0oC
- B. 15.0oC
- C. 20.0oC
- D. 30.0oC
Which of the following source of energy is renewable?
- A. sun
- B. petroleum
- C. coal
- D. uranium
Which of the following quantities has the same unit as energy?
- A. power
- B. work
- C. force
- D. momentum
Fuel was consumed at a steady rate of 5.0 x 10-2kg per second in a rocket engine and ejected as a gas with a speed of 4 x 103ms-1. Determine the thrust on the rocket
- A. 20N
- B. 80N
- C. 200N
- D. 800N
A body of mass 5kg moving with a velocity of 10ms-1 collides with a stationary body of mass 6kg. If the two bodies stick together and move in the same direction after their collision, calculate their common velocity
- A. 4.55ms-1
- B. 12.00ms-1
- C. 30.00ms-1
- D. 50.00ms-1
Which of the following about an object performing simple harmonic motion is correct? Its acceleration
- A. is maximum at the extreme ends
- B. is constant and directed towards a fixed point
- C. is zero when it is displayed from the equilibrum position
- D. varies linearly with the displacement from a fixed point and is directed towards the fixed point
The frequency of a swinging pendulum is the
- A. number of complete oscillations the pendulum makes in a second
- B. number of amplitudes the bob makes in a second
- C. angle the bob swings through in a second
- D. distance the bob covers in a second
A body starts from rest and accelerates uniformly at 5ms^-2 until it attains a velocity of 25ms-1. Calculate the time taken to attain this velocity
- A. 2.5s
- B. 5.0s
- C. 10.0s
- D. 125.0s
Which of the following type of motion does a body undergo when acted upon by a couple?V
- A. vibrational
- B. translational
- C. rotational
- D. random
Masses,m1 and m2 at the 20-cm and 65-cm marks respectively of a uniform metre rule freely suspended at its centre of gravity. If the metre rule balances horizontally, determine the ratio m2 : m1
- A. 2 : 1
- B. 3 : 3
- C. 2 : 3
- D. 1 : 2
A wheel and axle of radii 800mm and 200mm respectively is used to raise a body of weight 800N by the application of 250N. Calculate the efficiency of the machine
- A. 85%
- B. 80%
- C. 60%
- D. 20%
Which of the following simple machines is a second class lever?
- A. wheel barrow
- B. crowbar
- C. claw hammer
- D. seesae