Physics | Study Mode

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Question 1
A
20ms2, 20ms1 
B
25ms2, 250ms 
C
20ms2 200ms4 
D
10ms2 300ms-4 
Explanation.
Share Answer Ft = mv - mu
Ft = m (v-u)
100 x 10 = 5(v-0)
1000 = 5v
V = 200m/s
V = u at
200 = 0 mass
a = 20m/s2 (C)

Correct Option:
C
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Question 2
A
momentum is proportional to force action 
B
action is equal to reaction but in the opposite direction 
C
impulse force is inversely proportional to time 
D
force is proportional to rate of change of momentum 
Explanation.
Share Answer The second law of motion states that a body which is subjected to a net
external force (F) acquires
acceleration which is directly proportional to the force and inversely proportional to the mass of the body i.e. F = ma
(C)

Correct Option:
C
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Question 3
A
heat energy 
B
intent heat of fusion 
C
specific latent heat of fusion 
D
specific heat capacity 
Explanation.
Share Answer Specific latent heat of fusion (C)

Correct Option:
C
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Question 4
A
2.0 x 10-6m3 
B
2.5 x 10-6m3 
C
3.0 x10-6m3 
D
2.0 x 10-6m3 
Explanation.
Share Answer Weight of liquid displaced = Upthrust
= (0.040 - 0.024)N
= 0.016N = 0.016/10 = 1.6 X 10-3kg
Volume of the object = Volume of liquid displaced
=

Mass of liquid = 1.6 x 10-1kg
density of liquid 800kgm-2


= 2.0 x 106m3 (A)


Correct Option:
A
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Question 6
A
57,708J 
B
42,708J 
C
35,208J 
D
50,208J 
Explanation.
Share Answer Since I calorie = 4.184J
12,000 calorie = (4.184 x 12,000)J = 50.208J
heat supplied = Work done
() + U (internal energy)
50,208 = 7500J + 5
5 = (50.208 7500)J
= 42708J (A)

Correct Option:
A
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Question 7
A
convection 
B
conduction 
C
radiation 
D
conduction and radiation 
Explanation.
Share Answer Convection is the transfer of heat from a hotter region of a Fluid to a colder region through the actual motion of the fluid (A)

Correct Option:
A
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Question 8
A
8.06KJ 
B
706KJ 
C
538KJ 
D
6.72KJ 
Explanation.
Share Answer Heat required to change the phase of
mass, in of the substance is Q = rnLf
= 20kg x 336Kg-1
= 6.72 x 103J
= 6.72kJ (D)

Correct Option:
D
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Question 10
A
2000 watt 
B
3000 watt 
C
4000 watt 
D
5000 watt 
Explanation.
Share Answer Power, P = = FV

V = velocity
Power P = FV = (200N (20m/s)
= 4000W (C)


Correct Option:
C
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