From the diagram above, if the potential difference across the resistor, capacitor and inductor are 60V, 120V and 30V respectively, the effective potential difference is
- A. 81
- B. 67
- C. 59
- D. 73
Which of the following is a type of incandescent light source?
- A. Fluorescent lamp
- B. LED lamp
- C. Tungsten filament lamp
- D. Neon lamp
The working of the beam balance is based on the principle of
- A. moments
- B. conservation of energy
- C. equivalence
- D. floatation
The branch of physics that deals with the motion of objects and the forces acting on them is called:
- A. Electromagnetism
- B. Thermodynamics
- C. Mechanics
- D. Quantum mechanics
A charge of \(4.6 × 10^{-5}\)C is placed in an electric field of intensity \(3.2 × 10^4\) \(Vm^{-1}\). What is the force acting on the electron?
- A. 1.5 N
- B. 3.7 N
- C. 4.2 N
- D. 2.5 N
An explosion occurs at an altitude of 312 m above the ground. If the air temperature is -10.00°C, how long does it take the sound to reach the ground?
[velocity of sound at \(0^oC\) = 331 ms-1]
- A. 0.94s
- B. 0.96s
- C. 0.93s
- D. 0.95s
The diagram above illustrates the penetrating power of some types of radiation. X, Y and Z are likely
- A. X = α-particle; Y = γ-ray; Z = β-particle
- B. X = α-particle; Y = β-particle; Z = γ-ray
- C. X = γ-ray; Y = α-particle; Z = β-particle
- D. X = β-particle; Y = γ-ray; Z = α-particle
The sensitivity of a thermometer is
- A. All of the above
- B. how quickly a temperature change can be detected
- C. the difference between the maximum and the minimum temperature
- D. the smallest temperature change that can be detected or measured
An open-tube mercury manometer is used to measure the pressure in a gas tank. When the atmospheric pressure is 101,325 \(P_a\), what is the absolute pressure in \(P_a\) in the tank if the height of the mercury in the open tube is 25 cm higher. density of mercury = \(13600kg/m^3, g = 9.8m/s^2\)
- A. 108,986 Pa
- B. 165,238 Pa
- C. 122,364 Pa
- D. 134,645 Pa
A beam of light travelling in water is incident on a glass which is immersed in the water. The incident beam makes an angle of \(40^o\) with the normal. Calculate the angle of refraction in the glass.
[Refractive index of water = 1.33, Refractive index of glass = 1.5]
- A. \(29.36^o\)
- B. \(25.37^o\)
- C. \(37.21^o\)
- D. \(34.75^o\)
How much work is done against the gravitational force on a 3.0 kg object when it is carried from the ground floor to the roof of a building, a vertical climb of 240 m?
- A. 7.2 kJ
- B. 4.6 kJ
- C. 6.8 kJ
- D. 8.4 kJ
A relative density bottle has a mass of 19 g when empty. When it is completely filled with water, its mass is 66 g. What will be its mass if completely filled with alcohol of relative density 0.8?
- A. 47 g
- B. 52.8 g
- C. 37.6 g
- D. 56.6 g
An object is placed 35 cm away from a convex mirror with a focal length of magnitude 15 cm. What is the location of the image?
- A. 26.25 cm behind the mirror
- B. 10.5 cm behind the mirror
- C. 26.25 cm in front of the mirror
- D. 10.5 cm in front of the mirror
A piano wire 50 cm long has a total mass of 10 g and its stretched with a tension of 800 N. Find the frequency of the wire when it sounds its third overtone note.
- A. 800 Hz
- B. 600 Hz
- C. 400 Hz
- D. 200 Hz
A 35 kΩ is connected in series with a resistance of 40 kΩ. What resistance R must be connected in parallel with the combination so that the equivalent resistance is equal to 25 kΩ?
- A. 40 kΩ
- B. 37.5 kΩ
- C. 45.5 kΩ
- D. 30 kΩ
A block of mass 0.5 kg is suspended at the 40 cm mark of a light metre rule AB that is pivoted at point E, the 90 cm mark, and is kept at equilibrium by a string attached at point D, the 60 cm mark, as shown in the figure above. Find the tension T in the string.
[Take g = \(10 ms-2\) ]
- A. 16.67N
- B. 15.67N
- C. 14.67N
- D. 18.67N
A step-down transformer is used on a 2.2 kV line to deliver 110 V. How many turns are on the primary windings if the secondary has 25 turns?
- A. 20
- B. 250
- C. 200
- D. 500
The pinhole camera works on
- A. the principle of the reversibility of light
- B. the principle of the rectilinear propagation of light
- C. Huygen’s principle
- D. the principle of total internal reflection of light
Which of the following is/are not true about the heat capacity of a substance?
(i) It is an intensive property
(ii) Its S.I unit is \(jK-1\)
(iii) It is an extensive property
(iv) Its S.I unit is \(jkg-1\)
- A. (i) and (iii) only
- B. (i), (ii) and (iv) only
- C. (i) and (iv) only
- D. (ii) and (iii) only
The near point of a patient’s eye is 50.0 cm. What power (in diopters) must a corrective lens have to enable the eye to see clearly an object 25.0 cm away?
- A. 2 diopters
- B. 2.5 diopters
- C. 0.5 diopters
- D. 3 diopters
A travelling wave of amplitude 0.80 m has a frequency of 16 Hz and a wave speed of 20 \(ms-1\)
Calculate the wave number of the wave.
- A. 3
- B. 4
- C. 5
- D. 2