ENTRANCE TEST â€“ 2013 | Multiple Questions and Answers

11.	An object 15 cm from a lens produces a real image 30 cm from the lens. What is the focal length of the lens?

	A.	+15 cm
	B.	+20 cm
	C.	+10 cm
	D.	+25 cm

12.	Speed of sound through a gas is measured as 340 m/s at pressure P1 and temperature T1. What will be the speed of sound if pressure of gas is doubled but temperature is kept constant?

	A.	342 m/s
	B.	340 m/s
	C.	170 m/s
	D.	680 m/s

13.	The stress-strain graph, deduced the following limits successively

	A.	Proportional limit, yield limit, elastic limit
	B.	Yield limit, elastic limit, proportional limit
	C.	Proportional limit, elastic limit, yield limit
	D.	Elastic limit, proportional limit, yield limit

14.	A 4.0 m long wire is subjected to stretching force and its length increases by 40 cm. The percent elongation which the wire undergoes is:

	A.	0.10 %
	B.	40 %
	C.	10 %
	D.	20 %