1
AIPMT 2014
MCQ (Single Correct Answer)
+4
-1
A transformer having efficiency of 90% is working on 200 V and 3 kW power supply. If the current in the secondary coil is 6 A, the voltage across the secondary coil and the current in the primary coil respectively are
A
300 V, 15 A
B
450 V, 15 A
C
450 V, 13.5 A
D
600 V, 15 A
2
AIPMT 2014
MCQ (Single Correct Answer)
+4
-1
Light with an energy flux of 25 $$ \times $$ 104 W m$$-$$2 falls on a perfectly reflecting surface at normal incidence. If the surface area is 15 cm2, the average force exerted on the surface is
A
1.25 $$ \times $$ 10$$-$$6 N
B
2.50 $$ \times $$ 10$$-$$6 N
C
1.20 $$ \times $$ 10$$-$$6 N
D
3.0 $$ \times $$ 10$$-$$6 N
3
AIPMT 2014
MCQ (Single Correct Answer)
+4
-1
A beam of light of $$\lambda = 600$$ nm from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between first dark fringes on either side of the central bright fringe is
A
1.2 cm
B
1.2 mm
C
2.4 cm
D
2.4 mm
4
AIPMT 2014
MCQ (Single Correct Answer)
+4
-1
In the Young's double slit experiment, the intensity of light at a point on the screen where the path difference $$\lambda $$ is K, ($$\lambda $$ being the wavelength of light used). The intensity at a point where the path difference is $$\lambda $$/4 will be
A
K
B
K/4
C
K/2
D
zero
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