Physics (2017) | Study Mode

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Question 11
A
80.00%
B
76.60%
C
66.70%
D
60.70%
Explanation
Efficiency = \(\frac{ma}{V.R}\) x \(\frac{100}{1}\)

V.R = number of pulleys = 6

ma = \(\frac{\text{Load}}{\text{Effort}}\) = \(\frac{200}{50}\) = 4

Effiecieny = \(\frac{4}{6}\) \(\times\) 100 = 66.67%

Correct option: C
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Question 12
A

1

B

9

C

3

D

0.33

Explanation

Resistor connected in a parallel have an equivalence given by
\(\frac{1}{\text{Reff}}\) = \(\frac{1}{3}\) + \(\frac{1}{3}\) + \(\frac{1}{3}\)

= \(\frac{1 + 1 + 1}{3}\) = \(\frac{3}{3}\) = 1

Reff = 1


Correct option: A
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Question 13
A
A compressor
B
A refrigerator
C
Air blower
D
Air conditioner
Explanation
Compressor is an instrument to supply air or other gas at increased pressure
Refrigerator is an appliance to keep things cold
Air blower is used to release air
Air conditioner is used to remove heat and maintain a stable temperature in an occupied space

Correct option: D
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Question 14
A
protons
B
electrons
C
ions
D
neutrons
Explanation
Isotopy is due to difference in mass number, what causes the difference is the difference in the number of neutrons present

Correct option: D
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Question 15
A
Balance wheel of a watch
B
Construction of steel rail lines
C
Construction of large steel bridges
D
Fitting of tyres on wheels
Explanation
Thermal expansion of a solid is majorly advantageous in the use of bimetallic strip in the balance of a watch so as not to lose time

Correct option: A
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Question 16
A
kgm
B
m
C
Jm
D
m\(^{-1}\)
Explanation
Moment of a force is the product of a force and the perpendicular distance from the line of action of the force
Moment = force \(\times\) distance
= N \(\times\) m
= Nm

Correct option: B
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Question 17
A
80.00%
B
76.60%
C
66.70%
D
60.70%
Explanation

Explanation not provided, please join discuss, your contributions are welcomed


Correct option: C
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Question 18
A

10 cm

B

16 cm

C

5 cm

D

14 cm

Explanation

Magnification = \(\frac{\text{Length of camera}}{\text{distance of object from pin hole}}\)

m = \(\frac{12}{60}\)

= 0.2

Also magnification m = \(\frac{\text{Height of image}}{\text{Height of object}}\)

Height of image = m \(\times\) height of object

= 0.2 \(\times\) 70

= 14cm


Correct option: D
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Question 19
A

240v

B

340v

C

480v

D

57600v

Explanation

The relationship between the peak value and r.m.s value of electricity supply is given as

V\(_{r.m.s}\) = \(\frac{V_o}{\sqrt{2}}\)

where Vo = peak voltage

Vo = V\(_{r.m.s}\) x \(\sqrt{2}\)

= 240 x \(\sqrt{2}\)

= 339.5v

= 340v


Correct option: B
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Question 20
A
number of turns in the coil is increased
B
strength of the field magnet is increased
C
slip rings are replaced with split ring cummutator
D
coil is wound on a soft iron armature
Explanation
A d.c generator is one in which its current is allowed to flow in one direction even through it may vary in value an a.c generator can only be made to produce a d.c by replacing the two slip rings with a single split ring or commutator.

Correct option: C

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