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,
Choices
Choice (4)  Response  

a.  P is conductor and Q is semiconductor 

b.  P is ntype semiconductor and Q is ptype semiconductor 

c.  P is semiconductor and Q is conductor 

d.  P and Q are conductors of different materials 

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
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


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
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


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  

a.  Both Ꭺ and Ꭱ are false 

b.  Ꭺ is true but Ꭱ is false 

c.  Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ 

d.  Ꭺ is false but Ꭱ is true 
