Using the diagram above, the effective force pushing it forward at an angle 60º is
- A. 25.00N
- B. 28.87N
- C. 38.50N
- D. 43.30N
An electron falls from an energy level of -5.44eV to another energy level, E. If the emitted photon is of wavelength 5.68 x 10\(^{-6}\)m, calculate the energy change. [ Plank’s constant = 6.63 x 10\(^{-34}\)Js, emitted radiation speed = 3.0 x 10\(^8\)ms\(^{-1}\)]
- A. 1.49 x 10\(^{-20}\)J
- B. 1.49 x 10\(^{-19}\)J
- C. 3.49 x 10\(^{-20}\)J
- D. 3.49 x 10\(^{-19}\)J
A red shirt under a red light appears pale because red
- A. reflects nearly all light falling on it
- B. Unable to reflect lights falling on it
- C. absorbs all lights falling on it
- D. absorbs other colours and reflects red
Which of the following materials has a very large energy gap band?
- A. Conductor
- B. Insulator
- C. Semiconductor
- D. Intrinsic semiconductor
If the velocity ratio of a machine is 4, what does it mean?
- A. Load and the effort are equal.
- B. Distance moved by effort is 4 times greater than the distance moved by load.
- C. The efficiency is low
- D. The load is greater than the effort
A body is whirled in a horizontal circle at the rate of 800 revolutions per minute. Determine the angular velocity
- A. 100\(\pi\)rads\(^{-1}\)
- B. 33.3\(\pi\)rads\(^{-1}\)
- C. 29.5\(\pi\)rads\(^{-1}\)
- D. 26.7\(\pi\)rads\(^{-1}\)
When a cell of e.m.f 3.06V is connected, the balance of a potentiometer is 75cm, Calculate the new balance of a cell of e.m.f 2.295V
- A. 56.26cm
- B. 73.20cm
- C. 77.80cm
- D. 78.70cm
Calculate the quantity of heat for copper rod whose thermal capacity is 400Jk\(^{-1}\) for a temperature change of 60ºC to 80ºC
- A. 2KJ
- B. 4KJ
- C. 6KJ
- D. 8KJ
At absolute zero temperature, the average velocity of the molecules
- A. Decreases
- B. Increases
- C. Is zero
- D. Is uncertain
What is the least possible error encountered when taking measurement with a metre rule?
- A. 1.1mm
- B. 0.5mm
- C. 0.2mm
- D. 0.1mm
Convert 60ºC to degree Fahrenheit
- A. 111.15\(^0\)F
- B. 115.56\(^0\)F
- C. 132.23\(^0\)F
- D. 140.00\(^0\)F
A hydrometer of mass y kg and volume 2y x 10\(^{-5}\)m\(^3\) floats in a fluid with 20% of its volume above the fluid, what is the density of the fluid?
- A. 6.22 x 10\(^4\)kgm\(^{-3}\)
- B. 6.23 x 10\(^4\)kgm\(^{-3}\)
- C. 6.24 x 10\(^4\)kgm\(^{-3}\)
- D. 6.25 x 10\(^4\)kgm\(^{-3}\)
The energy in a moving car is an example of
- A. Mechanical energy
- B. Electrical energy
- C. Potential energy
- D. Kinetic energy
The property by which a material returns to its original shape after the removal of force is called
- A. Elasticity
- B. Ductility
- C. Malleability
- D. Plasticity
According to kinetic theory of gases, the pressure exerted by the gas on the wall is equal
- A. change in momentum per unit volume
- B. rate of change of momentum imparted by the walls per second per unit area
- C. momentum imparted to the walls per unit area
- D. change in momentum imparted to the walls per unit area
The degree of precision of a vernier caliper is
- A. 0.005cm
- B. 0.01cm
- C. 0.1cm
- D. 1.0cm
If the rate of evaporation is y, and the rate of condensation is x, then, a vapour is saturated when
- A. x > y
- B. x
- C. x = y
- D. x \(\leq\) y
In electrolysis, when same quantity of electricity is passed through different electrolytes, mass of substances deposited is proportional to
- A. Molecular weight
- B. Chemical equivalent
- C. Atomic number
- D. Chemical equivalent per valency
If a charge ion goes through a combined electric field E and magnetic field B, the resultant emergent velocity of the ion is
- A. \(\frac{E}{B}\)
- B. EB
- C. \(\frac{B}{E}\)
- D. E-B
What is the inductance reactance of a coil of 7H when connected to a 50Hz a.c circuit?
- A. 2200\(\Omega\)
- B. 2000\(\Omega\)
- C. 1200\(\Omega\)
- D. 1100\(\Omega\)
A refrigerator uses 150W. If it is kept on for 336 hours non-stop, what is the energy consumed in KWh?
- A. 60.20KWh
- B. 50.40KWh
- C. 25.01KWh
- D. 30.20KWh