The specific heat capacity of a body is defined as the amount of heat required to raise the temperature of unit mass of that body by 1°C or 1K. Different substances have different specific heat capacities. The bodies, which have more specific .....

Water is not used as a thermometric liquid because water has not uniform expansion as it contracts on heating from 0oC to 4oC and then expands on further heating from .....

The heat content of a body depends on the number of molecules contained in the body and the kinetic energy carried by the .....

Water is used in hot water bag because water has high specific heat capacity and water in hot water bag remains hot for a longer time than any other .....

This is because water at 4oC has minimum volume and when the beaker full of water at 4oC is heated, water expands for which it overflows from the .....

The amount of heat gained is equal to the amount of heat lost, this relation is called principle of .....

The coldest possible temperature at which the average kinetic energy of the molecules becomes zero is called absolute .....

a)      The specific heat capacity of the substance ‘A’ is 910 J/kg°C.

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Here, we are going to derive an equation, Q = m  .....

 Here, we have to find the final temperature of milk and tea .....

 Here, we have to calculate the specific heat capacity of an alloy.

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  Here, we have to find the final temperature of the iron.

Here, we have to find the temperature raised by the transfer of heat.

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  Here, we have to find the amount of heat required in the .....

It is not possible to make use of solar cells to meet all our energy needs because: 1. of limited availability of special grade semi-conducting materials such as silicon and germanium. 2.  the process of manufacturing of solar cells is very .....

The product of mass, specific heat capacity and change in temperature of a body is equal to the heat gained or heat loss, this relation is called the heat .....

Scientists are busy at designing solar equipment, it is because, solar energy is a perpetual source of energy and by using it, non-renewable sources of energy can be conserved for the future. It will push the energy crisis .....

The estimated temperature of the outer surface of the sun is about 10,000 Fahrenheit (5,600 .....

The government of Nepal encourages the farmer to establish biogas due to following reasons: I.    As Nepal is an agricultural country raw materials required for biogas i.e. dung or excreta of other .....

The electricity generated by rotating turbines with the help of water is called hydroelectricity. In the present context use of hydroelectricity is increasing due to following reason: I.    Hydropower is .....

In the context of Nepal, the use of solar energy should be highly prioritized, due to the following reasons: I.    In Nepal, high-quality fossil fuel sources are not found yet. Only low-quality .....

Use of hydroelectricity should be increased rather than that of coal and mineral oil for energy due to following reasons: I.    Coal and mineral oil are non-renewable sources of energy, which are found .....

The electricity generated by rotating turbines with the help of water is called hydroelectricity.The use of hydroelectricity should be the best alternative source of energy in the case of Nepal due to the following .....

Remedial measures to control energy crisis are as followings: I.    Energy conservation/Energy Saving  The solution to the energy crisis is energy saving. We should try to prevent the energy from .....

The differences between nuclear fusion and nuclear fission are: 

S.N. .....

The conditions which are available in the sun for the nuclear fusion reaction to take place are as follow: I. Plenty of hydrogen II) High temperature III) High .....

Coal and mineral oils are called non-renewable sources of energy because they exhaust when used and it takes millions of years for the .....

The energy released when a heavier nucleus splits or light nuclei combine together is called nuclear .....

The scarcity of energy that is likely to happen due to the depletion of fuel reserves is known as energy .....

The heat energy of the earth’s interior is called geothermal .....

The violent motions of the sea or ocean caused by the attraction exerted upon them by the moon are called .....

The energy which can be obtained from biomass like agricultural residue, wood and animal waste is known as biomass .....

Soln: Relative density of gold = density of golddensity of water = 9300kgm31000kgm3 = .....

Water pump pulls underground water by repetition of the process of down stroke and upstroke of the handle. When the handle of a water pump is lifted up, the piston is pushed down. In this condition, the volume of part A decreases and water pressure .....

From the figure, F1 = 250 N A1 = 20 cm2 F2 = 375 N A3 = 10 cm2 A2 =? F3 =? Now using formula,  F1A1 = F2A2  25020 = 375A2 A2 = 375 × 20 250 A2 = 30 cm2 Again, To find F3 Using formula,  A2 = 30 cm2 Again, To find F3 .....

To verify the law of flotation  Materials required: eureka can, beaker, top pan balance, dry wooden block, water, tripod stand.    Method: 1. An overflow can is kept over a top pan beaker. 2. The can is filled with water up to its .....

Archimedes's principle is applied in the following cases: a. Designing ships and submarines b. Determine the density of any liquid in hydrometer c. Floating of .....

a. Objects C has higher density than water. b. Object A will displace 1 Kg of water. As we know, from the law of floatation,     Mass of a floating body = Mass of displaced liquid .....

Given, Volume of the ice block (V1) = 24,000 cm3 Density of ice (d1) = 0.9g/cm3 Density of water (d2) = 1 g/cm3 Now, Fraction of ice in air (V2/V1) = ? We have, For floating bodies, W1 = W2         [From law of .....

Let us consider a cylinder of height ‘h’ and cross section area ‘A’ be completely immersed in the liquid of density d as shown in the figure. The horizontal thrusts on the cylinder which is shown by the arrows pointing .....

The catalyst which increases the rate of a reaction is called a positive .....

Steps I would take at home to save energy to save energy are as followings: I.    By switching off the light when it is not necessary and by regular servicing and checking of electrical .....

The barometer is made of o one meter long glass tube containing mercury. The upper end of the tube is closed and has vacuum above the mercury. When atmospheric pressure increases, the mercury level rises up in the tube and when the atmospheric .....

Water comes out from hole 'C' with the greatest force. As we know that, liquid pressure is directly proportional to the depth of the point from the free surface of the liquid, the depth of point C from free surface is more. Therefore, from .....

Soln: Depth of water (h) = 6 m Density of water ( d) = 1000 kg/m3 Acceleration due to gravity (g) = 9.8 m/s2 Water pressure (P) = ? We know that, P  = hdg     = 6 × 1000 × 9.8     = 58800 Pa. ∴ The .....

a.  Ans: When the piston 'A' is pushed in the inner part of the spherical vessel then all the piston B, C and D move equally  outward. This is because the liquid enclosed in a vessel transmits pressure equally in all .....

The weight of the body is 32N. As we know, Upthrust = weight of a body in air = weight of a body in liquid The weight of displaced liquid = Upthrust So, The weight of the displaced liquid = weight of a body in air = weight of a body in liquid or, 7 .....

The upward force with which liquid pushes a body immersed in the liquid is called upthrust. The liquid pressure exerted in both the tank is equal. The liquid pressure is given by the formula,  P = hdg, where h = height of the liquid column d .....

a.    A is the salt solution.    B is the Air.    C is Water. b.    A has more density. c.    We know,     Upthrust  =  weight of a substance in air - weight of a substance is a .....

i. The equipment shown in the diagram is a hydraulic machine . It works on the basis of pascal's law. ii. Given, Force on Piston ( F1) = 240N Area of piston A (A1) = 20cm2                     .....