Question 1

Q1. Which of the following processes involves gain of electrons?

Accepted Answer

Option B: Reduction. Reduction involves gain of electrons or removal of oxygen from a substance.

Question 2

Q2. The image formed by a plane mirror is:

Accepted Answer

Option C: Virtual and erect. Plane mirrors always form virtual, erect images of the same size as the object.

Question 3

Q3. Which part of the digestive system secretes bile juice?

Accepted Answer

Option B: Liver. The liver produces bile juice which helps in emulsification of fats.

Question 4

Q4. Which property of metals allows them to be beaten into thin sheets?

Accepted Answer

Option C: Malleability. Malleability is the property by which metals can be hammered into thin sheets.

Question 5

Q5. Which of the following is an abiotic component of an ecosystem?

Accepted Answer

Option C: Water. Abiotic components are non-living factors such as air, water, and soil.

Question 6

Q6. A student observed that a moist blue litmus paper turned red when exposed to a gas produced during combustion of sulphur. The gas is:

Accepted Answer

Option B: Sulphur dioxide. Sulphur dioxide dissolves in moisture to form acidic solution, turning blue litmus red.

Question 7

Q7. A 100 Ω resistor is connected across a 200 V source. The current flowing through the resistor is:

Accepted Answer

Option B: 2 A. Using Ohm's law: I = V/R = 200/100 = 2 A

Question 8

Q8. A plant root bends toward a water source placed nearby. This response is called:

Accepted Answer

Option C: Hydrotropism. Roots growing toward water show hydrotropism.

Question 9

Q9. Which statement is correct regarding ionic compounds?

Accepted Answer

Option B: They conduct electricity in molten state. In molten state, ions become free to move and conduct electricity.

Question 10

Q10. The number of electrons in a neutral atom is equal to:

Accepted Answer

Option C: Number of protons. Neutral atoms have equal numbers of protons and electrons.

Question 11

Q11. Sunglasses with UV protection are recommended because ultraviolet rays can:

Accepted Answer

Option B: Damage eye tissues. Excess UV exposure can harm the cornea and retina of the eyes.

Question 12

Q12. Assertion (A): Copper is used in electrical wiring. Reason (R): Copper has low electrical resistance.

Accepted Answer

Option A: Both A and R are true and R is correct explanation of A. Copper allows easy flow of current due to low resistance and high conductivity.

Question 13

Q13. Assertion (A): Greenhouse gases increase Earth's temperature. Reason (R): They trap heat radiated from Earth's surface.

Accepted Answer

Option A: Both A and R are true and R is correct explanation of A. Greenhouse gases absorb infrared radiation and increase global temperature.

Question 14

Q14. Case Study: A student used different indicators to test solutions. • Phenolphthalein turned pink in solution X • Blue litmus turned red in solution Y • Red litmus showed no change in solution Z Which solution is acidic?

Accepted Answer

Option B: Y. Acids turn blue litmus red, while phenolphthalein remains colourless in acidic medium.

Question 15

Q15. Case Study: A student placed an object beyond 2F in front of a convex lens and obtained a real inverted image between F and 2F. If the object is moved closer to F but remains outside F, the image will become:

Accepted Answer

Option C: Larger. As object approaches focus from beyond F, image size increases and shifts farther away.

Question 16

Q16. A student claims that all acids are dangerous and cannot be consumed. Which option disproves the statement?

Accepted Answer

Option D: Acetic acid in vinegar. Weak acids like acetic acid are safe in diluted edible forms. (HOTS concept)

Question 17

Q17. Why is rusting considered an undesirable process?

Accepted Answer

Option C: It corrodes and weakens iron objects. Rusting damages iron articles and reduces their durability and strength.

Question 18

Q18. A concave mirror forms an image of same size as the object. The object is placed at:

Accepted Answer

Option C: Centre of curvature. When object is at centre of curvature, image formed is real, inverted, and same size. (Commonly asked concept)

Question 19

Q19. Which of the following belongs to homologous series of alkanes?

Accepted Answer

Option C: C ₂ H ₆. Alkanes follow the general formula C H ₂ ₊₂ . Ethane (C ₂ H ₆ ) is an alkane.

Question 20

Q20. Two identical bulbs are connected in series across a battery. Compared to one bulb alone, the brightness of each bulb will:

Accepted Answer

Option C: Decrease. In series connection, voltage divides across bulbs, reducing current and brightness.

Mock Test 09 Performance Solutions

Detailed Question Analysis

Q1. Which of the following processes involves gain of electrons?

Q2. The image formed by a plane mirror is:

Q3. Which part of the digestive system secretes bile juice?

Q4. Which property of metals allows them to be beaten into thin sheets?

Q5. Which of the following is an abiotic component of an ecosystem?

Q6. A student observed that a moist blue litmus paper turned red when exposed to a gas produced during combustion of sulphur. The gas is:

Q7. A 100 \(\Omega\) resistor is connected across a \(200\,\mathrm{V}\) source. The current flowing through the resistor is:

Q8. A plant root bends toward a water source placed nearby. This response is called:

Q9. Which statement is correct regarding ionic compounds?

Q10. The number of electrons in a neutral atom is equal to:

Q11. Sunglasses with UV protection are recommended because ultraviolet rays can:

Q12. Assertion (A): Copper is used in electrical wiring. Reason (R): Copper has low electrical resistance.

Q13. Assertion (A): Greenhouse gases increase Earth's temperature. Reason (R): They trap heat radiated from Earth's surface.

Q14. Case Study: A student used different indicators to test solutions. • Phenolphthalein turned pink in solution X • Blue litmus turned red in solution Y • Red litmus showed no change in solution Z Which solution is acidic?

Q15. Case Study: A student placed an object beyond 2F in front of a convex lens and obtained a real inverted image between F and 2F. If the object is moved closer to F but remains outside F, the image will become:

Q16. A student claims that all acids are dangerous and cannot be consumed. Which option disproves the statement?

Q17. Why is rusting considered an undesirable process?

Q18. A concave mirror forms an image of same size as the object. The object is placed at:

Q19. Which of the following belongs to homologous series of alkanes?

Q20. Two identical bulbs are connected in series across a battery. Compared to one bulb alone, the brightness of each bulb will:

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Mock Test 09 Performance Solutions

Detailed Question Analysis

Q1. Which of the following processes involves gain of electrons?

Q2. The image formed by a plane mirror is:

Q3. Which part of the digestive system secretes bile juice?

Q4. Which property of metals allows them to be beaten into thin sheets?

Q5. Which of the following is an abiotic component of an ecosystem?

Q6. A student observed that a moist blue litmus paper turned red when exposed to a gas produced during combustion of sulphur. The gas is:

Q7. A 100 \(\Omega\) resistor is connected across a \(200\,\mathrm{V}\) source. The current flowing through the resistor is:

Q8. A plant root bends toward a water source placed nearby. This response is called:

Q9. Which statement is correct regarding ionic compounds?

Q10. The number of electrons in a neutral atom is equal to:

Q11. Sunglasses with UV protection are recommended because ultraviolet rays can:

Q12. Assertion (A): Copper is used in electrical wiring. Reason (R): Copper has low electrical resistance.

Q13. Assertion (A): Greenhouse gases increase Earth's temperature. Reason (R): They trap heat radiated from Earth's surface.

Q14. Case Study: A student used different indicators to test solutions. • Phenolphthalein turned pink in solution X • Blue litmus turned red in solution Y • Red litmus showed no change in solution Z Which solution is acidic?

Q15. Case Study: A student placed an object beyond 2F in front of a convex lens and obtained a real inverted image between F and 2F. If the object is moved closer to F but remains outside F, the image will become:

Q16. A student claims that all acids are dangerous and cannot be consumed. Which option disproves the statement?

Q17. Why is rusting considered an undesirable process?

Q18. A concave mirror forms an image of same size as the object. The object is placed at:

Q19. Which of the following belongs to homologous series of alkanes?

Q20. Two identical bulbs are connected in series across a battery. Compared to one bulb alone, the brightness of each bulb will:

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