NAT I Engineering Physics With Answers

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NAT I Engineering Physics

Sr. # Questions Answers Choice
1 When we apply reverse bias to a junction diode it Lowers the potential barrier Raises the potential barrier Increase the majority carrier current Decrease the majority carrier current
2 In a common base transistor circuit the current gain is 0.98.On changing the emitter current by 5.00 mA, the change in collector current is: 0.196 mA 2.45 mA 4.9 mA 5.1 mA
3 In case of p-n junction diode at high value of reverse bias the current rises sharply The value of reverse bias is known as Cut off voltage Zener voltage Inverse voltage Critical voltage
4 A cable breaks if stretched by more than 2 mm it is cut into two equal parts how much either part can be stretched without breaking? 0.25 m 0.5 m 1 mm 2 mm
5 For obtaining appreciable extension the wire should be Short and thin Long and thin Short and tick Long and thick
6 According to the Hooke's law the force required to change the length of a wire by '1' is proportional to 1<sup>-2</sup> 1<sup>-1</sup> 1 1<sup>2</sup>
7 A wire is stretched to double of its length.The strain is 2 1 Zero 0.5
8 How does the Young's modulus vary with the increase of temperature? Decrease Increase Remains constant First increases and then decreases
9 The modulus of rigidity of a liquid is Zero 1 Infinity A value not one of those mentioned above
10 Steel is preferred for making springs over copper.Whey? Steel is cheaper Young's modulus of steel is more than that of copper Young's modulus of copper is more than that of steel Steel is less likely to be oxidized
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