Which of the following is a reason why a concrete floor feels colder to the bare feet than a mat on the same floor during the rainy season?
- A. A mat if s better conductor of heat than the feet
- B. Mat losses heat to the bare feet at a faster rate than concrete floor
- C. Mat losses heat to the bare feet while the concrete floor extracts heat from them
- D. Concrete floor is a better conductor of heat than the mat
- E. Mat is a better conductor of heat than the floor
A given mass of gas has a pressure of 80Nm-2 at a temperature of 47oC. If the temperature is reduced to 27oC with the volume remaining constant, the new pressure is
- A. 46.0 Nm-2
- B. 75.0 Nm-2
- C. 80.0 Nm-2
- D. 85.3 Nm-2
- E. 139.4 Nm-2
The clinical thermometer is characterized by having a
- A. wide range of temperature
- B. wide bore
- C. long stem
- D. constriction
- E. narrow bore
Which of the following cannot be used to measure the temperature of a substance?
- A. variation of pressure with temperature
- B. expansivity of a liquid
- C. change in resistance of a conductor
- D. thermometric effect
- E. change in color with temperature
Which of the following statements about the gaseous state of matter is not correct? The molecules of a substance is in gaseous state
- A. are in constant state of motion
- B. have different speed
- C. have a temperature which is an average measure of the kinetic energy
- D. have no intermolecular attractive force
- E. have a pressure which is determined by the number of molecules present
The motion of a body is simple harmonic if the
- A. Acceleration is always directed towards a fixed point
- B. path of motion is a striaght line
- C. Acceleration is directed towards a fixed point and proportional to its distance from the point
- D. Acceleration is proportional to the square of the distance from a fixed point
- E. Acceleration is constant and directed towards a fixed point
Which of the following correctly gives the relationship between linear speed V and angular speed ω of a body moving uniformly in a circle of radius r?
- A. V = ωr
- B. V = ω2r
- C. V = ωr2
- D. V2 = ωr
- E. V = ω/r
A ball is thrown vertically upwards from the ground with an initial velocity of 50ms-1. What is the total time spent by the ball in the air? (g = 10ms-2)
- A. 2.5s
- B. 5.0s
- C. 10.0s
- D. 15.0s
- E. 20.0s
A catapult is used to project a stone. Which of the following energy conversions takes place as the stone is released?
- A. The kinetic energy of the stone is converted into gravitational potential energy
- B. The gravitational potential energy of the catapult is converted into kinetic energy of the stone
- C. The gravitational potential energy is converted into elastic potential energy
- D. The elastic potential energy of the catapult is converted into gravitational potential energy of the stone
- E. None of the above
A body is projected into space with an initial velocity V0 at an angle, θ to the horizontal. Which of the following statements is/are correct about its motion?
I. The total time of flight is (V0 Cosθ)/g.
II. The maximum height is (V0 Sin 2θ)/2g.
III. The range is (V02 Cos2θ)/g.
- A. I & II only
- B. I & III only
- C. II & III only
- D. II only
- E. III only
A ball of mass 0.5kg moving at 10ms-1 collides with another ball of equal mass at rest. If the two balls move off together after the impact, calculate their common velocity.
- A. 0.2ms-1
- B. 0.5ms-1
- C. 5.0ms-1
- D. 10.0ms-1
- E. 20.0ms-1
When three coplanar and non-parallel forces are in equilibrium,
I. they can be represented in magnitude and direction by the three sides of a triangle taken in order.
II. their lines of action meet at a point.
III. the magnitude of anyone equals the magnitude of the resultant of the other two.
IV. any one force is the equilibrant of the other two.
Which of the following statements above are correct?
- A. I & II only
- B. II & III only
- C. II, III & IV only
- D. I, II, III & IV
- E. I, III & IV only
A man will exact the greatest pressure on a bench when he
- A. lies flat on his back
- B. lies flat on his belly
- C. stand on both feet
- D. stand on one foot only
- E. stand on toes of one foot
The slope of a striaght line displacement time graph indicates the
- A. Distance travelled
- B. Uniform velocity
- C. Uniform acceleration
- D. Instantaneous acceleration
- E. Uniform speed
Which of the units of the following physical quantities are derived? I. Area II. Thrust III. Pressure IV. Mass
- A. I, II, III & IV
- B. I, II, III only
- C. I, II, IV only
- D. I, & III only
- E. I & IV only