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A scientist raises temperature of a solid of mass 40 kg from 20 °C to 40 °C, if energy used by solid is 8000 J, specific heat capacity of solid would be
10 J kg-1 °C-1
2 J kg-1 °C-1
5 J kg-1 °C-1
20 J kg-1 °C-1
A bus travelling eastwards at 60 m s-1 takes 10s to come to halt, its deceleration is equal to
6 m s-1 eastward
-6 m s-1² eastward
6 m s-1² eastward
-6 m s-1 eastward
Volume of mercury is 0.4 m³ and mass is 5440 kg, density of mercury is
136 kg m-3
13600 kg m-3
1360 kg m-3
13.6 kg m-3
Formula for gravitational potential energy is
Ep = mgh, where m is mass, g is gravitational pull and is height
Ep = mg/h, where m is mass, g is gravitational pull and is height
Ep = gh/m, where m is mass, g is gravitational pull and is height
Ep = m/gh, where m is mass, g is gravitational pull and is height
Formula for gravitational potential energy is
Ep = m/gh, where m is mass, g is gravitational pull and is height
Ep = mgh, where m is mass, g is gravitational pull and is height
Ep = gh/m, where m is mass, g is gravitational pull and is height
Ep = mg/h, where m is mass, g is gravitational pull and is height
Error due to manually stopping a stopwatch is termed as
climax error
human reaction time
ratability error
human reaction error
Standard symbol for heat capacity is
C
H
Q
E
Standard symbol for heat capacity is
C
E
Q
H
There are three kinds of equilibrium, which of following is odd one out
neutral equilibrium
Metastable equilibrium
unstable equilibrium
stable equilibrium
Mass of a car is 500 kg, which is lifted up by a crane at a height of 200 m, gravity is 10 N kg-1. Ep of car will be
25 J
1000000 J
4 J
10000 J
In physics, pressure is defined as
P = F/d
P = A × F
P = A/F
P = F/A
Specific latent heat of hot chocolate is 60 J kg-1 and its latent heat is 3 J, mass of hot chocolate would be
180 J
57 J
20 j
63 J
A ship moves at a speed of 4 ms-1. Water resistance acting on it is 4000 N. power of its engine is
24 kW
20 kW
16 Kw
11 kW
If a box is pulled by a rope making an angle with surface then horizontal component of force is equal to
None of above
F sinθ
F cosθ
F tanθ
Energy can be converted into some other forms but can not be
Decrease
destroyed
Increase
None of above
To heat our houses and run industry and transport, we use coal, oil and gas which are termed as
Chemicals
fossil fuels
molecules
fussions
Ablock weighing 18 N is lifted 7 m verticallyupward.
potential energy stored in it is
126 J
120 J
124 J
130 J
Energy that causes water to evaporate from surface to form water vapours is known as
electrical energy
chemical energy
heat energy
thermal energy
Fossil fuels are usually
mercuries
Potassium nitrate
Hydrocarbons
Ethanol
Efficiency of cyclist when he does 12 J of useful work from every 100 J of food energy he takes is
0.15
0.14
0.12
0.13
1
2
3
6
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