Question 1

Q1. Which of the following reactions is an example of double displacement reaction?

Accepted Answer

Option C: AgNO ₃ + NaCl → AgCl + NaNO ₃. In double displacement reactions, ions are exchanged between compounds to form new products.

Question 2

Q2. The image formed by a convex mirror is always:

Accepted Answer

Option B: Virtual and diminished. Convex mirrors always form virtual, erect, and smaller images regardless of object position.

Question 3

Q3. Which hormone regulates blood sugar level in humans?

Accepted Answer

Option C: Insulin. Insulin controls glucose level in blood by promoting uptake of glucose by cells.

Question 4

Q4. Which of the following substances has the highest pH value?

Accepted Answer

Option C: Soap solution. Soap solution is basic and has higher pH than acidic substances like lemon juice and vinegar.

Question 5

Q5. Which process helps in maintaining constant body temperature in humans?

Accepted Answer

Option C: Homeostasis. Homeostasis maintains stable internal conditions such as temperature and water balance.

Question 6

Q6. A student observed bubbles while placing zinc granules in dilute hydrochloric acid. The gas evolved burns with a pop sound. The gas is:

Accepted Answer

Option C: Hydrogen. Hydrogen gas evolves when zinc reacts with dilute hydrochloric acid and burns with a pop sound.

Question 7

Q7. A wire of resistance 10 Ω is cut into two equal halves. Resistance of each half becomes:

Accepted Answer

Option C: 5 Ω. Resistance is directly proportional to length. Halving the wire length halves the resistance. (Tricky numerical concept)

Question 8

Q8. A student notices that raisins swell when placed in water overnight. This is due to:

Accepted Answer

Option B: Osmosis. Water enters raisins through a semipermeable membrane due to osmosis.

Question 9

Q9. Which of the following is NOT a function of stomata?

Accepted Answer

Option C: Photosynthesis directly. Stomata assist gas exchange and transpiration but do not directly perform photosynthesis.

Question 10

Q10. The element with electronic configuration 2,8,7 belongs to:

Accepted Answer

Option B: Group 17. The element has 7 valence electrons and belongs to the halogen family in Group 17.

Question 11

Q11. Pressure cookers cook food faster mainly because:

Accepted Answer

Option B: Pressure increases boiling point of water. At higher pressure, water boils above 100°C, cooking food faster.

Question 12

Q12. Assertion (A): Diamond does not conduct electricity. Reason (R): Diamond has no free electrons.

Accepted Answer

Option A: Both A and R are true and R is correct explanation of A. All electrons in diamond are tightly bound in covalent bonds, leaving no free electrons for conduction.

Question 13

Q13. Assertion (A): Green plants are called producers. Reason (R): They prepare food using sunlight and chlorophyll.

Accepted Answer

Option A: Both A and R are true and R is correct explanation of A. Plants synthesize their own food by photosynthesis and hence are called producers.

Question 14

Q14. Case Study: A student tested the conductivity of different liquids using a bulb setup. The bulb glowed brightly in salt solution, dimly in tap water, and not at all in sugar solution. Which liquid is the best conductor?

Accepted Answer

Option C: Salt solution. Salt solution contains more free ions, allowing better conduction of electricity.

Question 15

Q15. Case Study: A ray of light passes from glass to air at a certain angle and bends away from the normal. The reason is:

Accepted Answer

Option C: Speed of light increases in air. Light speeds up when moving from denser glass to rarer air, causing bending away from the normal.

Question 16

Q16. A student says that all metals are solid at room temperature. Which option proves the statement incorrect?

Accepted Answer

Option B: Mercury. Mercury is a liquid metal at room temperature. (Commonly confused exception)

Question 17

Q17. In a food chain, only about 10% of energy is transferred to the next trophic level because:

Accepted Answer

Option B: Energy is lost as heat during life processes. Most energy is used in metabolic activities and lost as heat, so only a small fraction transfers.

Question 18

Q18. A student places an object at the focus of a concave mirror. The image formed will be:

Accepted Answer

Option C: At infinity. When the object is at the focus, reflected rays become parallel and meet at infinity. (High-frequency tricky concept)

Question 19

Q19. Which compound contains a functional group different from the others?

Accepted Answer

Option C: Ethanoic acid. Ethanoic acid contains the carboxyl (-COOH) group, while others contain alcohol (-OH) group.

Question 20

Q20. A student connected a 6 V battery to a resistor and measured current as 0.5 A. The resistance is:

Accepted Answer

Option B: 12 Ω. Using Ohm's law: R = V/I = 6/0.5 = 12 Ω

Mock Test 04 Performance Solutions

Detailed Question Analysis

Q1. Which of the following reactions is an example of double displacement reaction?

Q2. The image formed by a convex mirror is always:

Q3. Which hormone regulates blood sugar level in humans?

Q4. Which of the following substances has the highest pH value?

Q5. Which process helps in maintaining constant body temperature in humans?

Q6. A student observed bubbles while placing zinc granules in dilute hydrochloric acid. The gas evolved burns with a pop sound. The gas is:

Q7. A wire of resistance 10 \(\Omega\) is cut into two equal halves. Resistance of each half becomes:

Q8. A student notices that raisins swell when placed in water overnight. This is due to:

Q9. Which of the following is NOT a function of stomata?

Q10. The element with electronic configuration 2,8,7 belongs to:

Q11. Pressure cookers cook food faster mainly because:

Q12. Assertion (A): Diamond does not conduct electricity. Reason (R): Diamond has no free electrons.

Q13. Assertion (A): Green plants are called producers. Reason (R): They prepare food using sunlight and chlorophyll.

Q14. Case Study: A student tested the conductivity of different liquids using a bulb setup. The bulb glowed brightly in salt solution, dimly in tap water, and not at all in sugar solution. Which liquid is the best conductor?

Q15. Case Study: A ray of light passes from glass to air at a certain angle and bends away from the normal. The reason is:

Q16. A student says that all metals are solid at room temperature. Which option proves the statement incorrect?

Q17. In a food chain, only about 10@@MAT\(\mathrm{H_2}\)@@ of energy is transferred to the next trophic level because:

Q18. A student places an object at the focus of a concave mirror. The image formed will be:

Q19. Which compound contains a functional group different from the others?

Q20. A student connected a \(6\,\mathrm{V}\) battery to a resistor and measured current as \(0.5\,\mathrm{A}\). The resistance is:

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Mock Test 04 Performance Solutions

Detailed Question Analysis

Q1. Which of the following reactions is an example of double displacement reaction?

Q2. The image formed by a convex mirror is always:

Q3. Which hormone regulates blood sugar level in humans?

Q4. Which of the following substances has the highest pH value?

Q5. Which process helps in maintaining constant body temperature in humans?

Q6. A student observed bubbles while placing zinc granules in dilute hydrochloric acid. The gas evolved burns with a pop sound. The gas is:

Q7. A wire of resistance 10 \(\Omega\) is cut into two equal halves. Resistance of each half becomes:

Q8. A student notices that raisins swell when placed in water overnight. This is due to:

Q9. Which of the following is NOT a function of stomata?

Q10. The element with electronic configuration 2,8,7 belongs to:

Q11. Pressure cookers cook food faster mainly because:

Q12. Assertion (A): Diamond does not conduct electricity. Reason (R): Diamond has no free electrons.

Q13. Assertion (A): Green plants are called producers. Reason (R): They prepare food using sunlight and chlorophyll.

Q14. Case Study: A student tested the conductivity of different liquids using a bulb setup. The bulb glowed brightly in salt solution, dimly in tap water, and not at all in sugar solution. Which liquid is the best conductor?

Q15. Case Study: A ray of light passes from glass to air at a certain angle and bends away from the normal. The reason is:

Q16. A student says that all metals are solid at room temperature. Which option proves the statement incorrect?

Q17. In a food chain, only about 10@@MAT\(\mathrm{H_2}\)@@ of energy is transferred to the next trophic level because:

Q18. A student places an object at the focus of a concave mirror. The image formed will be:

Q19. Which compound contains a functional group different from the others?

Q20. A student connected a \(6\,\mathrm{V}\) battery to a resistor and measured current as \(0.5\,\mathrm{A}\). The resistance is:

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