A person can see clearly objects only when they lie between 50 cm and 400 cm from his eyes . In order to increase the maximum distance of distinct vision to infinity, the type and power of the correcting lens, the person has to use. will be
A
convex, + 2.25 diopter
B
concave, $$-$$0.25 diopter
C
concave, $$-$$0.2 diopter
D
convex, + 0.15 diopter
2
NEET 2016 Phase 2
MCQ (Single Correct Answer)
+4
-1
A parallel-plate capacitor of area a, plate separation d and capacitance C is filled with four dielectric materials having dielectric constants k1, k2, k3 and k4 as shown in the figure. If a single dielectric material is to be used to have the same capacitance C in this capacitor, then its dielectric constant k is given by
The potential difference (VA $$-$$ VB) between the points A and B in the given figure is
A
$$-$$ 3V
B
+3 V
C
+6 V
D
+9 V
4
NEET 2016 Phase 2
MCQ (Single Correct Answer)
+4
-1
A filament bulb (500 W, 100 V) is to be used in a 230 V main supply. When a resistance R is connected in series, it works perfectly and the bulb consumes 500 W. The value of R is