2021-06-23 14:15:45
Physics trails
1. A man walks 1km due east and then 1km due north. His displacement is
_
A.√2 N45°E
B. 1km N 30°E
C. 1km N 15° E
D. D.√2 km N 60° E
2. The density of 400cm of palm oil was 0.9g before frying. If the density of the oil was 0.6 after frying, assuming no loss of oil to spilling, its new volume was
A.360 3 B.600 3 C.2403 D.8003
3. Which of the following is true of an electrical charge?
A. Positive charge means deficit electrons
B. Negative charge means excess of electrons
C. Electric current means movement of electrons
D. All of the above
4. Natural radioactivity consists of the emission of -------.
A. ∝-particles and β-rays
B. ∝-particles and X-rays
C. ∝-particles, β-rays and g-rays D. γ-rays and X-rays
5. Which of the following does NOT describe the image formed by a plane mirror?
A. Erect
B. Laterally inverted
C. Same distance from mirror as object
D. Magnified
6. What is the resultant resistance of the circuit given above?
A. 8Ω B. 11Ω C. 4Ω D. 3.6Ω
7. Which of the following best describes the energy changes which take place when a steam engine drives a generator which lights a lamp?
A. Heat → Light → Sound→ Kinetic
B. Heat→ Kinetic → Electricity→ Heat and Light
C. Kinetic→ Light → Heat →Electricity
D. Electricity →Kinetic→ Heat→ Light
8. Cathode rays are
__
A. High-energy electromagnetic waves
B. protons
C. neutrons
D. streams of electrons
9. A narrow beam of white light can be split into different colours by a glass prism. The correct explanation is that
A. white light is an electromagnetic wave
B. the prism has all the colours of the white light
C. different colours of white light travel with different speeds in glass
D. white light has undergone total internal reflection in the prism.
10.
Figure 2 represents a block- and-
tackle pulley system on which an
effort of W Newtons supports a load of 120.0N. If the efficiency of the machine is 40, then the value of W is
A. 28.0 N B. 48.0 N C. 288.0 N D. 50.0 N
11. What type of reaction is represented by the following
13. The electrochemical equivalent of silver 0.0012g/C/ of 36.0g of silver is to be deposited by electrolysis on a surface by passing a steady current for 5.0 minutes, the current must be
A. 6000A B. 100A C. 10A D. 1A
14. Shadows and eclipses result from the
A. refraction of light
B. reflection of light.
C. defraction of light
D. rectilinear propagation of light
15. Which of the following obeys Ohm’s Law?
A. All metals
B. Diode only
C. All electrolytes D. Glass
scheme? 21 + 21 energy
→ 32
+ 10n +
A. Fusion reaction
B. Fission reaction
C. Chain reaction
D. Radioactive decay
12. The amount of heat needed to raise the temperature of 10kg of copper by 1K its ____
A. specific heat capacity B. latent heat
C. heat capacity
D. internal energy
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 has 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.
17.
In the diagram above, the hanging mass m is adjusted until m is on the verge of sliding. The
coefficient of static friction between mass m and the table is
A. B. C. 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 and the road surface.
A. I and III only B. II and III only C. II only
D. I, II and II
19. In the diagram below, if the atmosphere pressure is 760mm, the pressure in the chamber G is
A. 660mm B. 830mm C. 690mm D. 860mm
20. Which of the following has the lowest internal resistance when new?
A. Leclanche cell B. Daniel cell
C. Torch battery D. Accumulator
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