10th Class Board Examination - Physical Science Mock Test (Set 2)
10th Class Board Examination - Physical Science Mock Test (Set 2)
Section A: Multiple Choice Questions (1 Mark Each)
1. The mirror used by dentists to examine the teeth of patients is a:
A) Convex mirror
B) Concave mirror
C) Plane mirror
D) Cylindrical mirror
2. The chemical reaction Fe₂O₃ + 2Al → Al₂O₃ + 2Fe is an example of a:
A) Combination reaction
B) Double displacement reaction
C) Decomposition reaction
D) Displacement reaction
3. The instrument used for measuring electric potential difference is a:
A) Ammeter
B) Galvanometer
C) Voltmeter
D) Potentiometer
4. Tooth enamel, the hardest substance in the body, is made up of:
A) Calcium phosphate
B) Calcium carbonate
C) Calcium sulphate
D) Calcium chloride
5. The colored part of the human eye that controls the size of the pupil is the:
A) Cornea
B) Retina
C) Iris
D) Optic nerve
6. Which of the following non-metals is lustrous (shiny)?
A) Sulphur
B) Oxygen
C) Nitrogen
D) Iodine
7. The splitting of white light into its seven component colors when passed through a glass prism is called:
A) Refraction
B) Dispersion
C) Reflection
D) Scattering
8. The allotrope of carbon that is a good conductor of electricity and is used as a dry lubricant is:
A) Diamond
B) Fullerene
C) Graphite
D) Coal
9. When a dilute acid reacts with a reactive metal like zinc, which gas is typically evolved?
A) Oxygen
B) Nitrogen
C) Carbon dioxide
D) Hydrogen
10. The direction of induced current in a conductor moving in a magnetic field is given by:
A) Fleming's Left-Hand Rule
B) Fleming's Right-Hand Rule
C) Right-Hand Thumb Rule
D) Ampere's Swimming Rule
Section B: Short Answer Questions (2 Marks Each)
11. Write two main points of difference between a real image and a virtual image.
12. What is an alloy? Give the name and the constituent metals of any one common alloy.
13. State Ohm's law. What are the necessary conditions for this law to hold true?
14. Why is respiration considered an exothermic reaction? Explain briefly.
15. Why does a compass needle get deflected when it is brought near a bar magnet?
Answer Key & Solutions
Section A: MCQs
B (Concave mirror)
D (Displacement reaction)
C (Voltmeter)
A (Calcium phosphate)
C (Iris)
D (Iodine)
B (Dispersion)
C (Graphite)
D (Hydrogen)
B (Fleming's Right-Hand Rule)
Section B: Short Answers
Answer 11: * Real Image: It is formed when light rays actually meet after reflection or refraction. It can be obtained on a screen (e.g., the image formed on the retina of the eye).
Virtual Image: It is formed when light rays appear to meet when produced backwards. It cannot be obtained on a screen (e.g., the image formed by a plane mirror).
Answer 12: An alloy is a homogeneous mixture of two or more metals, or a metal and a non-metal, created to improve the properties of the base metal (like increasing strength or preventing rust).
Example: Brass is an alloy made up of Copper (Cu) and Zinc (Zn). (Alternative example: Bronze, made of Copper and Tin).
Answer 13: Ohm's law states that the current (I) flowing through a metallic conductor is directly proportional to the potential difference (V) applied across its ends, provided that the physical conditions, such as temperature, remain constant. ($V = I \times R$)
Answer 14: Respiration is considered an exothermic reaction because energy is released during this process. During respiration, the glucose in our cells combines with oxygen from the air we breathe. This chemical breakdown of glucose releases energy, which our body uses to function, along with carbon dioxide and water as byproducts.
Answer 15: A compass needle is essentially a small bar magnet. When it is brought near another bar magnet, its magnetic field interacts with the magnetic field of the bar magnet. Due to the forces of attraction and repulsion between their respective magnetic poles (like poles repel, unlike poles attract), the compass needle experiences a force that causes it to deflect.
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