Which of the following units is the S.I. unit of heat capacity?
- A. Jkg-1
- B. Jkg-1 K-1
- C. JK-1
- D. Jg-1K-1
Which of the following concepts is a method of heat transfer that does not require a material medium?
- A. conduction
- B. radiation
- C. diffusion
- D. convection
In an experiment in which a molten substance is allowed to cool, the cooling curve above was obtained. The temperature 60oC is known as the
- A. vaporization point
- B. cooling temperature
- C. boiling point
- D. melting point
In an experiment in which a molten substance is allowed to cool, the cooling curve above was obtained. The temperature 60oC is known as the
- A. vaporization point
- B. cooling temperature
- C. boiling point
- D. melting point
A battery of emf 24V is connected to three resistor P, Q and R as illustrated in the diagram. Determine the voltage across the resistor Q
- A. 5v
- B. 10v
- C. 14v
- D. 24v
A quantity of hot water at 100oC is added to 400g of water at 10oC until the temperature of the mixture is 60oC.
Calculate the mass of the hot water added. [Specific heat capacity of water =4200JKg-1 K-1]
- A. 200g
- B. 320g
- C. 400g
- D. 500g
The diagram above illustrates a block ans tackle pulley system in which an effort E supports a load of 100.0N. If the efficiency of the machine is 75%, calculate the value of E
- A. 22.2N
- B. 38.0N
- C. 67.0N
- D. 75.0N
Water is unsuitable for use as a thermometric liquid because it
- A. expands unevenly between 0oC and 40oC
- B. has narrow temperature range
- C. has a concave meniscus
- D. maintains a fixed density
The crackling noise produced by aluminum roofing sheets on a house during a hot sunny day is a result of
- A. thermal equilibrium of the sheets
- B. conduction of heat by the sheets
- C. contraction of the sheets
- D. expansion of the sheets
A body of mass 1000kg is released from a height of 10m above the ground. Determine its kinetic energy just before it strikes the ground .[g = 10ms-2]
- A. 10J
- B. 103J
- C. 104J
- D. 105J
A uniform bar AB is balanced on a knife-edge which is 60cm from B by a mass of 22g which hangs at C 10cm from A. Calculate the mass of the bar.
- A. 133.2g
- B. 66.0g
- C. 60.0g
- D. 22.0g
A bullet fired vertically upwards reaches a height of 500m. Neglecting air resistance, calculate the magnitude of the initial velocity of the bullet. [g = 10ms-2]
- A. 500.0ms-1
- B. 100.0ms-1
- C. 70.0ms-1
- D. 50.0ms-1
Two strings each inclined at an angle 30o to the horizontal are used to hold a bucket of water weighing 20N. Calculate the tension i n each string.
- A. 20 (\sqrt{3}\)N
- B. 20N
- C. 10 (\sqrt{3}\)N
- D. 10N
In a school compound a girl walks 40km due east from the laboratory to the staff room to submit her report. Then she returns and walks 30m due north to her classroom. Determine the magnitude of her displacement from the10m laboratory
- A. 10m
- B. 35m
- C. 50m
- D. 70m
Which of the following statements describes a body in a stable equilibrium correctly?
- A. a person walking on a tight-rope
- B. ball on a smooth horizontal table
- C. ball resting on an inverted hemisphere bowl
- D. ball in the middle of a nemispherical bowl
A body is projected with an initial velocity U at an angle O to the horizontal. The time taken by it to reach its maximum height is given by the expression
- A. \(\frac{2u \text{sin}\theta}{g}\)
- B. \(\frac{u^2 \text{sin}^2\theta}{2g}\)
- C. \(\frac{u \text{sin}\theta}{g}\)
- D. \(\frac{u \text{sin}\theta}{2g}\)
The slope of a straight-line velocity-time graph represents
- A. uniform acceleration
- B. uniform speed
- C. total distance travelled
- D. workdone
The resultant force in a couple is
- A. zero
- B. infinite
- C. the sum of the forces
- D. thr product of the forces
An object floats in a fluid when it displaces it’s
- A. volume of liquid in which it floats
- B. mass of fluid in which it foats
- C. weith of fluid in which it foats
- D. density of fluid in which it foats
The barometric reading at a place is 73.5m Hg. Calculate the pressure at a point 30m below the surface of water contained in a reservoir at the place. [g = 10ms\(^{-2}\), density of mercury = 1.2 x 10\(^4\)kg m\(^{-3}\), density of water = 1.0 x 10\(^3\)m\(^{-3}\)]
- A. 4.0 x 105 Nm-2
- B. 3.0 x 10 5 Nm-2
- C. 2.0 x 105 Nm-2
- D. 1.0 x 105 Nm-2