71)For any position of the object in front of the human eye, the image distance is
A) 25 cm
B) 5 cm
C) 2.5 cm
D) 1 cm
View Answer
C) 2.5 cm
72)Which among the following colours has the maximum angle of deviation?
A) Red
B) Blue
C) Green
D) Violet
View Answer
D) Violet
73)A doctor has advised to use 2.5 D lens. The focal length of the lens is
A) 40 cm
B) 250 cm
C) 2.5 cm
D) 50 cm
View Answer
A) 40 cm
74)Read the following two statements and pick the correct answer:
A) Only (a) is true
B) Only (b) is true
C) Both (a) and (b) are true
D) Both (a) and (b) are false
View Answer
B) Only (b) is true
75)Volt per ampere is called
A) watt
B) coulomb
C) farad
D) ohm
View Answer
D) ohm
76)Which among the following quantities has the unit ohm-metre?
A) Resistance
B) Resistivity
C) Charge
D) Potential difference
View Answer
B) Resistivity
77)Which among the following materials has greater resistivity at room temperature?
A) Iron
B) Glass
C) Gold
D) Germanium
View Answer
B) Glass
78)Three resistors each of 6 Ω are connected in the form of a triangle. The resistance across any two comers of the triangle is
A) 0.25 Ω
B) 6 Ω
C) 4 Ω
D) 18 Ω
View Answer
C) 4 Ω
Explanation:If three equal resistors are connected in the form of a triangle, then the resistance across any two corners of triangle = 2R/3
Here R = 6 Ω
∴ 2×6/3 = 4 Ω
79)If V is the voltage, R is the resistance and I is the current, then the equation for electric power is
A) V2/R
B) IR2
C) V2R
D) V/I
View Answer
A) V2/R
80)A potential difference of 40 V is maintained across across a conductor of resistance 20 Ω at constant temperature. The current passing through it is in amperes ………………………
A) 0.05
B) 80
C) 20
D) 2
View Answer
D) 2
Explanation:Resistance = R = 20 Ω
Potential difference = V = 40 V
∴ Passing current = I = V/R = 40/20 = 2amp.
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