The pressure of a fixed mass of an ideal gas at 27°C is 3 pa. The gas is heated at a constant volume until its pressure is 5 pa. Determine the new temperature of the gas.
- A. 100oC
- B. 227oC
- C. 273oC
- D. 500oC
According to the kinetic theory of gasses, which of the following property of a gas can be affected by the collision of the gas molecule with the walls of the container?
- A. temperature
- B. energy
- C. viscosity
- D. pressure
A body of mass 200g and specific heat capacity 0.4Jg-1k-1 cools from 37oC to 31oC. Calculate the quantity of the heat released by the body.
- A. 4800J
- B. 1200J
- C. 480J
- D. 202J
A relative density bottle of volume 50cm3 is completely filled with a liquid at 30oC. It is then heated to 80oC such that 0.75cm3 of the liquid is expelled. Calculate the apparent cubic expansivity of the liquid.
- A. 0.00030k-1
- B. 0.00032k-1
- C. 0.01970k-1
- D. 0.02030k-1
A cube made of metal of linear expansivity \(\alpha\) is heated through a temperature \(\theta\). If the initial volume of the cube is Vo, the correct expression for the increase in volume of the cube is
- A. \(\frac{1}{3} \alpha V_o \theta\)
- B. \(\frac{1}{2} \alpha V_o \theta\)
- C. \(2 \alpha V_o \theta\)
- D. \(3 \alpha V_o \theta\)
Which of the following statements distinguishes thermal conduction for convection? i. Conduction requires a material medium while convection does not ii. In convection, there is actual motion of hot material, while in conduction, molecules molecules vibrates faster about their mean positions iii. Conduction takes place in solids while convection takes place in fluids.
- A. i and ii only
- B. ii and iii only
- C. i and iii only
- D. i, ii and iii
The ice and steam point on a mercury-in-glass thermometer are 10cm and 30cm respectively. Calculate the temperature in decree Celsius when the mercury meniscus is the 14cm mark
- A. 20oC
- B. 30oC
- C. 34oC
- D. 70oC
Which of the following surfaces will radiate heat energy best?
- A. Red surface
- B. white surface
- C. black surface
- D. yellow surface
Mechanical energy can be either
- A. kinetic or electric
- B. chemical or potential
- C. potential or kinetic
- D. electric or heat
A plane inclined at 30o to the horizontal has an efficiency of 50%. Calculate the force parallel to the plane required to push a load of 120N uniformly upn the plane
- A. 50.0N
- B. 120.0N
- C. 200.0N
- D. 240N
A car of mass 800kg moves from rest on a horizontal track and travels 60m in 20s with uniform acceleration. Assuming there were no frictional forces, calculate the accelerating force
- A. 240.0N
- B. 800.0N
- C. 1600.00N
- D. 2400.0N
An external force of magnitude 100N acts on a particle of mass 0.15kg for 0.03s. Calculate the change in the speed of the particle
- A. 50ms-1
- B. 25ms-1
- C. 20ms-1
- D. 5ms-1
A block of mass 4.0kg causes a spiral spring to extend by 0.16m from its unstretched position. The block is removed and another body of mass 0.50kg is hung from the same spiral spring. If the spring is then stretched and released, what is the angular frequency of the subsequent motion? [g = 10 ms -2]
- A. 10\(\sqrt 5\) rads-1
- B. 5\(\sqrt 2\) rads-1
- C. 5 rads-1
- D. \(\sqrt 5\) rads-1
A swinging pendulum between the rest position and its maximum displacement possesses
- A. Kinetic energy only
- B. potential energy only
- C. gravitational energy only
- D. both kinetic and potential energy
A body accelerates uniformly from rest at 2ms-2. Calculate the magnitude of its velocity after travelling 9m
- A. 4.5 ms-1
- B. 6.0ms-1
- C. 18.0-1
- D. 36.0-1
A body moving with an initial velocity U accelerates until it attains a velocity of V within a time t. The distance, s covered by the body is given by the expressions
- A. s = (\(\frac{v - u}{2}\))t
- B. s = (\(\frac{v + 2u}{2}\))t
- C. s = (\(\frac{v + u}{2}\))t
- D. s = (\(\frac{2v + u}{2}\))t
The team rectilinear acceleration means the rate of increase of
- A. velocity along a circular path in a unit time
- B. distance along a rectangular path in a unit time
- C. displacement along a straight-line path in a unit time
- D. velocity along a straight-line path in a unit time
An object of mass 2 kg moves with a uniform speed of 10ms-1 for 5s along an straight path. Determine the magnitude of its acceleration
- A. 0 ms-2
- B. 1 ms-2
- C. 3 ms-2
- D. 4 ms-2
a body moving at a constant speed accelerates when it is in
- A. rectilinear motion
- B. translational motion
- C. circular motion
- D. vibrational motion
A mass of mass m, experiences a viscous drag, F and an upthrust, U as he descends towards the ground at a steady velocity, Using a parachute. If the acceleration of free fall is g, which of the following expressions is correct?
- A. FU = mg
- B. U + F - mg = 0
- C. U - F = mg
- D. F - U - mg = 0
Which of the following statements about solid friction are correct? It i. is a force ii. occurs between the surfaces of two bodies in contact iii. depends on the area in contact
- A. i and ii only
- B. i adnd iii only
- C. ii and iii only
- D. i, ii and iii