Q. No. 17 to 20 are Assertion - Reasoning based questions. These consist of two statements - Assertion (A) and Reason (R). Answer these questions selectingthe appropriate option given below: (a) Both \( A \) and \( R \) are true and \( R \) is the correct explanation of \( A \) (b) Both \( A \) and \( R \) are true and \( R \) is not the correct explanation of \( A \) (c) \( A \) is true but \( R \) is false (d) \( A \) is False but \( R \) is true 17.Assertion: Silver bromide decomposition is used in black and white photography. Reason: Light provides energy for this exothermic reaction. 18. Assertion: Height in pea plants is controlled by efficiency of enzymes and is thus geneticallycontrolled. Reason: Cellular DNA is the information source for making proteins in the cell. 19.Assertion: Amphibians can tolerate mixing of oxygenated and deoxygenated blood. Reason: Amphibians are animals with two chambered heart 20 . Assertion: On freely suspending a current - carrying solenoid, it comes to rest in Geographical N-S direction. Reason: One end of current carrying straight solenoid behaves as a North pole andthe other end as a South pole, just like a bar magnet. \( (2 \times 6=12) \)
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Assertion: Silver bromide decomposition is used in black and white photography. Reason: Light provides energy for this exothermic reaction. Both the assertion and the reason are true. In black and white photography, silver bromide is used as a light-sensitive Show more…
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Question Nos. 21 to 30 are Assertion-Reason type. Each of these contains two Statements: Statement 1 (Assertion), Statement Il (Reason). Each of these questions also has four alternative choice, only one of which is correct. You have to select the correct choices from the codes (a), (b), (c) and (d) given below (a) If both Assertion and Reason are true and the Reason is correct explanation of the Assertion (b) If both Assertion and Reason are true but Reason is not correct explanation of the Assertion (c) If Assertion is true but Reason is false (d) If Assertion is false but the Reason is true Assertion While operating Wheatstone bridge [PO box], in starting, the key of the battery is closed first and the key of the galvanometer is closed later and when the circuit is to be switched off then switches are released in the reverse order. Reason This is done to avoid the damage of galvanometer due to induced emf.
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Round 1
Assertion-Reason type. Each of these contains two Statements: Statement 1 (Assertion), Statement II (Reason). Each of these questions also has four alternative choice, only one of which is correct. You have to select the correct choices from the codes (a), (b), (c) and (d) given below (a) If both Assertion and Reason are true and the Reason is correct explanation of the Assertion. (b) If both Assertion and Reason are true but Reason is not correct explanation of the Assertion. (c) If Assertion is true but Reason is false. (d) If Assertion is false but the Reason is true. Assertion Susceptibility is defined as the ratio of intensity of magnetisation $I$ to magnetic intensity $H$. Reason Greater the value of susceptibility smaller value of intensity of magnetisation $I$.
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Round 2
Assertion-Reason type. Each of these contains two Statements: Statement 1 (Assertion), Statement II (Reason). Each of these questions also has four alternative choice, only one of which is correct. You have to select the correct choices from the codes (a), (b), (c) and (d) given below (a) If both Assertion and Reason are true and the Reason is correct explanation of the Assertion. (b) If both Assertion and Reason are true but Reason is not correct explanation of the Assertion. (c) If Assertion is true but Reason is false. (d) If Assertion is false but the Reason is true. Assertion An iron bar magnet is heated to $1000^{\circ} \mathrm{C}$ and then cooled in a magnetic field in free space. It does not retain its magnetism. Reason Only ferro-magnets can show hysteresis.
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