A boy standing 408m from a wall blew a trumpet and heard the echo 2.4s later. Calculate the speed of the sound
- A. 310m/s
- B. 320m/s
- C. 330m/s
- D. 340m/s
The dimension of power is
- A. ML\(^2\)T\(^{-3}\)
- B. ML\(^1\)T\(^2\)
- C. ML\(^2\)T\(^{-2}\)
- D. MLT\(^2\)
An example of a non-rechargeable cell is
- A. nickel iron
- B. mercury cadmium
- C. dry leclanche
- D. lead-acid
The acceleration of a free fall due to gravity is not a constant everywhere on the Earth’s surface because
- A. mass of the earth
- B. elliptical shape of the earth
- C. variation in the density of the earth
- D. rotation of the earth about its axis
Find the amount of current required to deposit 0.02kg of metal in a given electrolysis for 120 seconds. [electro chemical equivalent of the metal = 1.3 x 10\(^{-7}\)kgC\(^{-1}\)]
- A. 7.8 x 10\(^{-4}\)A
- B. 7.8 x 10\(^{-2}\)A
- C. 1.3 x 10\(^3\)A
- D. 1.3 x 10\(^5\)A
Using the circuit above, at resonance
- A. V\(_L\) = V\(_R\)
- B. V\(_R\) = V\(_R\)
- C. V\(_L\) = V\(_L\)
- D. V\(_L\) = V\(_C\)
Photometer is used to measure
- A. Kinetic energy of liberated electrons
- B. Intensity of light
- C. frequency of light
- D. wavelength of light
As per Faraday’s laws of electromagnetic induction, an e.m.f is induced in a conductor whenever
- A. lies parallel to the magnetic flux
- B. lies in a magnetic field
- C. lies out side but close to a magnetic field
- D. cuts magnetic flux
One of these is not the use of an electroscope
- A. testing the type of charge on a charge body
- B. measuring ionization current in air
- C. detecting the pressure of charge on a charged body
- D. producing electric charge in a body
The bursting of water pipes during very cold weather, when the water in the pipes form ice could be attributed to
- A. contraction of pipes when cooled
- B. expansion of water on freezing
- C. contraction of water on freezing
- D. expansion of ice on melting
The velocity ratio of an inclined plane at 60ยบ to the horizontal is
- A. 1.055
- B. 1.155
- C. 1.255
- D. 2.00
The device for measuring the angle of dip is
- A. Dip circle
- B. Dip inclination
- C. Dip variation
- D. Dip meter
The diaphragm in the camera is similar to what part of the eyes?
- A. Cornea
- B. Lens
- C. Ciliary muscle
- D. Iris
In the diagram above, the galvanometer is converted to
- A. Voltmeter
- B. Ammeter
- C. Voltameter
- D. Hypsometer
An air force jet flying with a speed of 335m/s went past an anti-aircraft gun. How far is the aircraft 5s later when the gun was fired?
- A. 838m
- B. 1675m
- C. 670m
- D. 3350m
Two points on a velocity-time graph have coordinates (2s, 5m/s) and (4s, 15m/s). Calculate the mean acceleration
- A. 5.0ms\(^2\)
- B. 0.83ms\(^2\)
- C. 1.5ms\(^2\)
- D. 2.0ms\(^2\)
Two capacitors of 0.0003ฮผF and 0.0006ฮผF are connected in series, find their combined capacitance.
- A. 0.0009ฮผF
- B. 0.0002ฮผF
- C. 0.0005ฮผF
- D. 0.0001ฮผF
An accumulator is 90% efficient. If it gives out 2700J of energy while discharging, how much energy does it take in?
- A. 3600J
- B. 3000J
- C. 3200J
- D. 2430J
Calculate the value of electric field intensity due to a charge of 4ฮผC if the force due to the charge is 8N
- A. 2.0 x 10\(^6\)NC\(^{-1}\)
- B. 3.0 x 10\(^6\)NC\(^{-1}\)
- C. 4.0 x 10\(^6\)NC\(^{-1}\)
- D. 8.0 x 10\(^6\)NC\(^{-1}\)
What is the colour of red rose under a blue light?
- A. Green
- B. Blue
- C. Yellow
- D. Black
Which of the following measuring instruments operates based on the heating effect of electric current?
- A. moving iron ammeter
- B. hot wire ammeter
- C. galvanometer
- D. electric heater