Physics 2015 | Study Mode

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Question 61
A
Temperature gradient
B
Mass
C
Work
D
Time
Explanation

Temperature gradient(Tg) = DT L = T2 T1 L

i.e it is the ratio of an increment in temperature to the length

Hence, Temperature gradient (Tg) has defined direction alongside with magnitude

And it is a vector quantity

Mass, work & Time are scalar quantity


Correct option: A
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Question 62
A
Efficiency of transformer = (secondary coil primary coil) 100%
B
Efficiency of transformer = (mechanical advantage velocity ratio) 100%
C
Efficiency of a transformer = (Number of turns in the secondary coil Number of turns in the primary coil) 100%
D
Efficiency of a transformer = (power developed in the secondary coil power supplied to the primary coil) 100%
Explanation
Efficiency of a transformer = (power developed in the secondary coil power supplied to the primary coil) 100%

Correct option: D
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Question 63
A
Have high boiling points
B
have low boiling points
C
have high densities
D
have high melting points
Explanation
Volatile liquids (i.e. Ammonia or Freon) are usually have low boiling point

Correct option: B
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Question 64
A
2 m/s
B
4 m/s
C
12 m/s
D
14 m/s
Explanation
d = y, s = 6 m/s (The Man & Plane Mirror)

d y, s = (5 6) m/s (The Man and Image)

d2 s1 = d2 s2, y 6 = 2y s + 6

Y (s + 6) = 2y 6

s + 6 = 12

So = 12 6 = 6

Since S + 6 = 0

Then, S = 6 (substitute the value of S i.e S = 6)

Into S + 6 = 0

So = S + 6 = 6 + 6 = 12 m/s

S = 12 m/s

Correct option: C
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Question 65
A
Voltmeter
B
Meter rule
C
Galvanometer
D
Potentiometer
Explanation
Voltmeter: an instrument for measuring electric potential in volts

Galvanometer: it is a device used to indicate direction of a small electric current

Potentiometer: is a device for measuring or comparing e.m.fs of cells

Meter rule: measuring a distance at different points

Correct option: D
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Question 66
A
I only
B
II and IV only
C
II only
D
III only
Explanation
In an inelastic collision, linear momentum is conserved and energy is decreased

Momentum and kinetic energy are conserved in elastic collision

Correct option: B
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Question 67
A
III only
B
II & III only
C
I only
D
II, III & IV only
Explanation
Simple pendulum does not depend on thermal expansion

Five alarms, Thermostat and Bimetallic thermometer are application of thermal expansion of solid

Correct option: C
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Question 68
A
27C to 43C
B
30C to 40
C
98.4C only
D
Between 35C to 37C
Explanation
The range of temperature is between 35C and 43C but for normal temperature of human body is between the range of 35C to 37C respectively

Correct option: D
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Question 69
A
force
B
Impulse
C
Energy
D
Inertia
Explanation
Inertia: the property of a body that resists any change to its uniform motion, equivalent to its mass

Correct option: D
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Question 70
A
Inelastic collision
B
Elastic collision
C
Explosion
D
Spacecraft
Explanation
Momentum and kinetic energy are conversed in elastic collision

Correct option: B

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