11. What type of reaction is represented by the following scheme?
\(_{1} ^{2} X\) + \(_{1} ^{2} Y\) —–> \(_{2} ^{3} Z\) + \(_{1} ^{0} n\) + energy
- A. fusion reaction
- B. fission reaction
- C. Chain reaction
- D. Radioactive decay
Correct Option: Answer is A
Nuclear fusion is a reaction in which two or more atomic nuclei are combined to form one or more different atomic nuclei and subatomic particles (neutrons or protons). The difference in mass between the reactants and products is manifested as either the release or absorption of energy.
12. The amount of heat needed to raise the temperature of 10kg of Copper by 1K is its
- A. specific heat capacity
- B. latent heat
- C. heat capacity
- D. internal energy
Correct Option: Answer is A
Specific heat capacity is the amount of heat energy required to raise the temperature of a substance per unit of mass. The specific heat capacity of a material is a physical property.
13. The electrochemical equivalent of silver is 0.0012g/C. If 36.0g of silver is to be deposited by electrolysis on a surface by passing a steady current for 5mins, the current must be?
- A. 6000A
- B. 100A
- C. 10A
- D. 1A
Correct Option: Answer is B
I = M ÷ (Z × t)
I = 36 ÷ (0.0012 × 5 × 60)
I = 100A
14. Shadows and eclipses result from the
- A. refraction of light
- B. reflection of light
- C. defraction of light
- D. rectilinear propagation of light
Correct Option: Answer is D
Rectilinear propagation describes the tendency of Electromagnetic waves (light) to travel in a straight line. Light only deviates from a straight line when the medium it is travelling through changes density.
15. Which of the following obeys Ohm’s law?
- A. all metals
- B. diode only
- C. all electrolytes
- D. glass
Correct Option: Answer is A
Ohm’s law states that the current through a conductor between two points is directly proportional to the voltage across the two points.
16. Which of the following statements are TRUE of isotopes?
I. Isotopes of an element have the same chemical properties because they have the same number of electrons
II. Isotopes of elements are normally separated using physical properties
III. Isotopes of an element have the same number of protons in their nuclei
- A. I and II only
- B. I and III only
- C. II and III only
- D. I, II and III
Correct Option: Answer is B
17.
In the diagram given the hanging mass m2 is adjusted until m1 is on the verge of sliding. The coefficient of static
- A. \(\frac{m_1}{m_2}\)
- B. \(\frac{m_1g}{m_2}\)
- C. \(\frac{m_2}{m_1}\)
- D. \(\frac{m_2g}{m_1}\)
Correct Option: Answer is D
18. Which of the following may be used to explain a mirage?
I. Layers of air near the road surface have varying refractive indices in hot weather
II. Road surfaces sometimes become good reflectors in hot weather
III. Light from the sky can be reflected upwards after coming close to the road surface.
- A. I and III only
- B. II and III only
- C. II only
- D. I, II and III
Correct Option: Answer is A
19.
In the diagram given if the atmospheric pressure is 760mm, the pressure in the chamber G Is
- A. 660mm
- B. 890mm
- C. 690mm
- D. 860mm
Correct Option: Answer is B
20. Which of the following has the lowest internal resistance when new?
- A. Leclanche cell
- B. Daniell cell
- C. Torch battery
- D. Accumulator
Correct Option: Answer is D
An accumulator is an energy storage device: a device which accepts energy, stores energy, and releases energy as needed. Some accumulators accept energy at a low rate (low power) over a long time interval and deliver the energy at a high rate (high power) over a short time interval.