NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1671 - 1674 of 2142
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Question number: 1671
» Electronic Devices » Semiconductors
Question
Wires P and Q have the same resistance at ordinary (room) temperature. When heated, resistance of P increases and that of Q decreases. We conclude that,
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| a. | P is conductor and Q is semiconductor |
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| b. | P is n-type semiconductor and Q is p-type semiconductor |
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| c. | P is semiconductor and Q is conductor |
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| d. | P and Q are conductors of different materials |
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Question number: 1672
» Oscillations and Waves » Simple Pendulum
Question
The bob of a pendulum of length l is pulled aside from its equilibrium position through an angle θ and then released. The bob will then pass through its equilibrium position with a speed v, where v equals
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Question number: 1673
» Oscillations and Waves » Simple Harmonic Motion » Oscillations of a Spring
Question
A simple pendulum has time period T 1. The point of suspension is now moved upward according to equation y = kt 2 where k = l m/sec 2. If new time period is T 2 then ratio will be
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Question number: 1674
» Electronic Devices » Semiconductors
Assertion (Ꭺ)
Conductivity of a semiconductor increases on doping.
Reason (Ꭱ)
On doping the temperature of the semiconductor increases.
Choices
| Choice (4) | Response | |
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| a. | Both Ꭺ and Ꭱ are false |
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| b. | Ꭺ is true but Ꭱ is false |
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| c. | Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ |
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| d. | Ꭺ is false but Ꭱ is true |
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