When two waves are superimposed on each other, the following occurrences are possible, except
- A. nodal lins
- B. anti nodal lines
- C. stationary waves
- D. dispersion
Which of the following factors decreases the rate of evaporation of a liquid?
- A. increase in pressure over the liquid
- B. lowering the boiling point
- C. decreasing in humidity
- D. wind
A piece of copper of mass 20g at a temperature of 110°C was dropped into a mixture of ice and water at 0°C. If the final steady temperature of the mixture is 0°C . Calculate the amount of ice that melted [Specific heat capacity of copper = 0.4 Jg\(^{-1}\)K\(^{-1}\), specific latent heat of fusion of ice = 330Jg\(^{-1}\)]
- A. 0.37g
- B. 0.60g
- C. 2.40g
- D. 2.70g
In the formation of sea breeze. wind blows from
- A. sky to land
- B. sea to sky
- C. land to sea
- D. sea to land
The thermopile is a device for detecting
- A. radioactive radiations
- B. radiant energy
- C. x-rays
- D. the presence of electrons
A metal sheet of area 100cm\(^2\) was heated through 70°C. Calculate its new area if the linear expansivity of the metal is 0.000017K\(^{-1}\).
- A. 100.06 cm2
- B. 100.12cm2
- C. 100.24cm2
- D. 100.36cm2
A body is pulled through a distance of 500m by a force of 20N. If the power developed is 0.4kW, calculate the time for which the force acts
- A. 250.0s
- B. 25.0s
- C. 2.5s
- D. 0.5s
A girl stands on a scale in a lift. If the reading on the scale is less than her weight, then the lift is moving
- A. upward at uniform speed
- B. upward with uniform acceleration
- C. downward with uniform speed
- D. downward with uniform acceleration
A resultant force of magnitude 15N acts on a body of mass 250g. Calculate the magnitude of the acceleration
- A. 0.06 ms-2
- B. 3.75ms-2
- C. 16.67ms-2
- D. 60.00ms-2
The tendency for a stationary body to continue to remain at rest when a force is applied to it is known as
- A. friction
- B. impulse
- C. inertia
- D. momentum
A simple pendulum makes 50 oscillations in one minute. Determine its period of oscillation
- A. 0.02s
- B. 0.83s
- C. 1.20s
- D. 50.00s
When a body is slightly tilted, it is found that its centre of gravity is slightly raised. What is the state of equilibrium of the body?
- A. unstable
- B. stable
- C. neutral
- D. cannot be determined
An object is dropped from the top of a tower. If it takes 4s for it to reach the ground, calculate the height of the tower.(g = 10 ms-2, ignore air resistance)
- A. 20m
- B. 40m
- C. 80m
- D. 160m
The time of flight for a projectile motion is given by the expression
- A. \(\frac{U sin \theta}{g}\)
- B. \(\frac{U sin \theta}{2g}\)
- C. \(\frac{2U sin \theta}{g}\)
- D. \(\frac{U sin 2\theta}{g}\)
A bird flies at 10ms\(^{-1}\) for 3s, 15ms\(^{-1}\) for 3s and 20 ms\(^{-1}\) for 4s. Calculate the bird’s average speed
- A. 4.5 ms-1
- B. 15.0 ms-1
- C. 15.5 ms-1
- D. 51.7 ms-1
Which of the following substances is the most volatile at room temperature?
- A. water
- B. diesel
- C. petrol
- D. kerosine
The movement of fluid up or down a narrow tube is
- A. osmosis
- B. brownian motion
- C. capillarity
- D. diffusion
A metal ball of weight W falls through a column of glycerine of viscosity V. If the ball experiences an upthrust U and terminal velocity is attained, then
- A. W > U + V
- B. W = U + V
- C. W = U - V
- D. W < U + V
A block of wood of density 0.6 gcm\(^{-3}\), weighing 3.06N in air, floats freely in a liquid of density 0.9 gcm\(^{-3}\). Calculate volume of the portion immersed (g = 10ms\(^{-2}\))
- A. 510cm3
- B. 340cm3
- C. 254cm3
- D. 170cm3
Which of the following devices is used to determine the relative density of an acid?
- A. manometer
- B. hydrometer
- C. hypsometer
- D. hygrometer