NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics: Questions 1712  1717 of 2320
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Question number: 1712
» Electronic Devices » Junction Transistor
Question
In NPN transistor the collector current is 10 mA . If 90 % of electrons emitted reach the collector, then
Choices
Choice (4)  Response  

a.  Emitter current will be 9 mA  
b.  Emitter current will be 11.1 mA  
c.  Base current will be 0.01 mA  
d.  Base current will be 0.1 mA 
Question number: 1713
» Electronic Devices » Logic Gates (Or, and, NOT, NAND and Nor)
Question
The truthtable given below is for which ate?
A  B  C 
0  0  1 
0  1  1 
1  0  1 
1  1  0 
Choices
Choice (4)  Response  

a.  OR.  
b.  AND  
c.  XOR  
d.  NAND 
Question number: 1714
» Electronic Devices » Logic Gates (Or, and, NOT, NAND and Nor)
Question
Correct statement for ‘NOR’ gate is that, it gives
Choices
Choice (4)  Response  

a.  High output when both the inputs are low  
b.  Low output when both the inputs are low  
c.  High output when both the inputs are high  
d.  All of the above 
Question number: 1715
» Oscillations and Waves » Periodic Functions
Question
The time period of a simple pendulum of length L as measured in an elevator descending with acceleration is
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Passage
Sound from a point isotropic source spreads equally in all directions in homogeneous medium. Therefore its intensity decreases with square of distance from the source. When distance between observer and the source changes, apart from changes in intensity, the observer listens sound of pitch higher or lower than actual pitch depending upon the fact that the distance between the observer and source is decreasing or increasing respectively. An observer O is at a distance 2R from center of a circle of radius R. A point isotropic sound source S moves on the circle with uniform angular velocity . Initially observer, source and Centre of the circle are in same line.
Question number: 1716 (1 of 3 Based on Passage) Show Passage
» Oscillations and Waves » Longitudinal and Transverse Waves
Question
Sound emitted by the source at two successive instants t _{1} and t _{2} has minimum and maximum observed pitch respectively, then 
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 1717 (2 of 3 Based on Passage) Show Passage
» Oscillations and Waves » Wave Motion
Question
During a complete round trip of star on the circle, the observer listens a sound, whose 
Choices
Choice (4)  Response  

a.  During the first half time wavelength increases then decreases to the original value  
b.  Wavelength first decreases to maximum value then increases to the original value  
c.  Wavelength first increases to a maximum value then decreases to the original value  
d.  Question does not provide sufficient data or is vague 