Question 1

Q1. Which of the following substances is used to test the presence of carbon dioxide gas?

Accepted Answer

Option B: Lime water. Carbon dioxide turns lime water milky due to formation of calcium carbonate.

Question 2

Q2. The splitting of white light into its constituent colours is called:

Accepted Answer

Option B: Dispersion. When white light passes through a prism, it splits into different colours due to dispersion.

Question 3

Q3. Which part of nephron is mainly responsible for filtration of blood?

Accepted Answer

Option B: Bowman's capsule. Ultrafiltration of blood occurs in Bowman's capsule through glomerular capillaries.

Question 4

Q4. Which of the following metals is stored in kerosene oil?

Accepted Answer

Option C: Sodium. Sodium reacts vigorously with air and moisture, so it is stored under kerosene.

Question 5

Q5. Which statement correctly explains why soaps are less effective in hard water?

Accepted Answer

Option B: Soap forms insoluble scum with calcium and magnesium ions. Calcium and magnesium ions react with soap to form insoluble precipitates called scum.

Question 6

Q6. A student connected an ammeter incorrectly in parallel with a resistor. What is MOST likely to happen?

Accepted Answer

Option C: Ammeter may get damaged. Ammeters have very low resistance and must always be connected in series. Parallel connection may cause excessive current. (Tricky practical concept)

Question 7

Q7. A person cannot read a book clearly unless it is kept far away from the eyes. The defect is:

Accepted Answer

Option B: Hypermetropia. Hypermetropic persons cannot see nearby objects clearly and need convex lenses for correction.

Question 8

Q8. A student observes that bread kept in a moist place develops fungus faster than bread kept in a refrigerator. This happens because:

Accepted Answer

Option B: Low temperature slows microbial growth. Microorganisms grow rapidly in warm moist conditions, while refrigeration slows their activity.

Question 9

Q9. Which of the following is a balanced chemical equation?

Accepted Answer

Option C: 2H ₂ + O ₂ → 2H ₂ O. Balanced equations have equal number of atoms of each element on both sides.

Question 10

Q10. The tendency of an atom to attract electrons towards itself in a chemical bond is called:

Accepted Answer

Option C: Electronegativity. Electronegativity measures the attraction of bonded electrons by an atom.

Question 11

Q11. Non-stick cookware is coated with Teflon because it:

Accepted Answer

Option C: Is heat resistant and chemically inert. Teflon prevents food from sticking and does not react chemically during cooking.

Question 12

Q12. Assertion (A): Zinc can displace iron from iron sulphate solution. Reason (R): Zinc is more reactive than iron.

Accepted Answer

Option A: Both A and R are true and R is correct explanation of A. A more reactive metal displaces a less reactive metal from its salt solution.

Question 13

Q13. Assertion (A): A concave mirror can form both real and virtual images. Reason (R): Position of object affects image formation.

Accepted Answer

Option A: Both A and R are true and R is correct explanation of A. Concave mirrors form different types of images depending on object position relative to focus.

Question 14

Q14. Case Study: A student used red cabbage extract as a natural indicator. • In solution A, it turned pink • In solution B, it turned green • In solution C, no major colour change occurred Which solution is basic?

Correct Answer: Option B (B)

Concept Explanation: Natural indicators like red cabbage turn green in basic solutions.

Accepted Answer

Option B: B. Natural indicators like red cabbage turn green in basic solutions.

Question 15

Q15. Case Study: During an experiment, a ray of light travelling from air enters a glass slab obliquely and emerges parallel to the incident ray but shifted sideways. This phenomenon is called:

Accepted Answer

Option B: Lateral displacement. In a rectangular glass slab, the emergent ray remains parallel but undergoes sideways shift called lateral displacement.

Question 16

Q16. A student says all metals conduct electricity equally well. Which option disproves this statement?

Accepted Answer

Option A: Silver is best conductor. Different metals have different conductivities; silver conducts electricity better than most metals. (HOTS concept)

Question 17

Q17. Why are decomposers important in an ecosystem?

Accepted Answer

Option C: They recycle nutrients back into environment. Decomposers break down dead matter and return nutrients to the soil.

Question 18

Q18. A convex lens has focal length 20 cm. Its power is:

Accepted Answer

Option A: +5 D. Power = 1/f (in metres) = 1/0.20 = +5 D (Formula-based tricky question)

Question 19

Q19. Which of the following compounds belongs to homologous series of alcohols?

Accepted Answer

Option B: C ₂ H ₅ OH. Alcohols contain hydroxyl (-OH) functional group. Ethanol belongs to alcohol homologous series.

Question 20

Q20. A student connects two identical resistors in parallel across a battery. Compared to a single resistor, the total current drawn from the battery will:

Accepted Answer

Option C: Increase. Parallel combination decreases effective resistance, increasing total current from the battery.

Mock Test 06 Performance Solutions

Detailed Question Analysis

Q1. Which of the following substances is used to test the presence of carbon dioxide gas?

Q2. The splitting of white light into its constituent colours is called:

Q3. Which part of nephron is mainly responsible for filtration of blood?

Q4. Which of the following metals is stored in kerosene oil?

Q5. Which statement correctly explains why soaps are less effective in hard water?

Q6. A student connected an ammeter incorrectly in parallel with a resistor. What is MOST likely to happen?

Q7. A person cannot read a book clearly unless it is kept far away from the eyes. The defect is:

Q8. A student observes that bread kept in a moist place develops fungus faster than bread kept in a refrigerator. This happens because:

Q9. Which of the following is a balanced chemical equation?

Q10. The tendency of an atom to attract electrons towards itself in a chemical bond is called:

Q11. Non-stick cookware is coated with Teflon because it:

Q12. Assertion (A): Zinc can displace iron from iron sulphate solution. Reason (R): Zinc is more reactive than iron.

Q13. Assertion (A): A concave mirror can form both real and virtual images. Reason (R): Position of object affects image formation.

Q14. Case Study: A student used red cabbage extract as a natural indicator. • In solution A, it turned pink • In solution B, it turned green • In solution C, no major colour change occurred Which solution is basic?

Q15. Case Study: During an experiment, a ray of light travelling from air enters a glass slab obliquely and emerges parallel to the incident ray but shifted sideways. This phenomenon is called:

Q16. A student says all metals conduct electricity equally well. Which option disproves this statement?

Q17. Why are decomposers important in an ecosystem?

Q18. A convex lens has focal length 20 cm. Its power is:

Q19. Which of the following compounds belongs to homologous series of alcohols?

Q20. A student connects two identical resistors in parallel across a battery. Compared to a single resistor, the total current drawn from the battery will:

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Mock Test 06 Performance Solutions

Detailed Question Analysis

Q1. Which of the following substances is used to test the presence of carbon dioxide gas?

Q2. The splitting of white light into its constituent colours is called:

Q3. Which part of nephron is mainly responsible for filtration of blood?

Q4. Which of the following metals is stored in kerosene oil?

Q5. Which statement correctly explains why soaps are less effective in hard water?

Q6. A student connected an ammeter incorrectly in parallel with a resistor. What is MOST likely to happen?

Q7. A person cannot read a book clearly unless it is kept far away from the eyes. The defect is:

Q8. A student observes that bread kept in a moist place develops fungus faster than bread kept in a refrigerator. This happens because:

Q9. Which of the following is a balanced chemical equation?

Q10. The tendency of an atom to attract electrons towards itself in a chemical bond is called:

Q11. Non-stick cookware is coated with Teflon because it:

Q12. Assertion (A): Zinc can displace iron from iron sulphate solution. Reason (R): Zinc is more reactive than iron.

Q13. Assertion (A): A concave mirror can form both real and virtual images. Reason (R): Position of object affects image formation.

Q14. Case Study: A student used red cabbage extract as a natural indicator. • In solution A, it turned pink • In solution B, it turned green • In solution C, no major colour change occurred Which solution is basic?

Q15. Case Study: During an experiment, a ray of light travelling from air enters a glass slab obliquely and emerges parallel to the incident ray but shifted sideways. This phenomenon is called:

Q16. A student says all metals conduct electricity equally well. Which option disproves this statement?

Q17. Why are decomposers important in an ecosystem?

Q18. A convex lens has focal length 20 cm. Its power is:

Q19. Which of the following compounds belongs to homologous series of alcohols?

Q20. A student connects two identical resistors in parallel across a battery. Compared to a single resistor, the total current drawn from the battery will:

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