Online NAT IM Pre Medical Physics Test Preparation for Pakistani Students

NAT I Medical Physics

Sr. #	Questions	Answers Choice
1	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
2	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
3	For obtaining appreciable extension the wire should be	Short and thin Long and thin Short and tick Long and thick
4	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>
5	A wire is stretched to double of its length.The strain is	2 1 Zero 0.5
6	How does the Young's modulus vary with the increase of temperature?	Decrease Increase Remains constant First increases and then decreases
7	The modulus of rigidity of a liquid is	Zero 1 Infinity A value not one of those mentioned above
8	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