Materials that show very small plastic range beyond elastic limit are called
Brittle materials have shorter plastic region, i.e., the proportional and fracture points are close.
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Breaking stress is ______ for a material, but breaking force ____ and depends on _____________.
Breaking stress is fixed for a material, but breaking force varies and depends on area of cross section.
A solid sphere placed in a fluid under high pressure experiences force
A solid sphere immersed in a liquid will experience compressive force perpendicular to all the points on the surface. Hence,... View Article
Which of the following factors can bring about a change in the elastic properties of a material? (A) Length of the material (B) Change in temperature (C) Presence of impurities (D) None of the above.
Answer: (B) Change in temperature and (C) presence of impurities Following are the factors affecting the elasticity of the material: Hammering... View Article
The total mechanical energy of a system is conserved if the forces that act on it are
The total mechanical energy of a system is conserved if the forces that act on it are conservative in nature.... View Article
How does the modulus of elasticity change with temperature?
The modulus of elasticity decreases with increase in temperature.
SI unit of thermal conductivity is
The SI unit of thermal conductivity is Watt per metre Kelvin. The dimensional formula of thermal conductivity is M1L1T-2θ-1. Thermal... View Article
What is the unit of the coefficient of thermal conductivity K?
The unit of the coefficient of thermal conductivity K is Wm-1K-1. Thermal conductivity of a material is defined as the measure... View Article
The heat of sun comes to us through:
The heat of sun comes to us through the process of radiation.
In which methods of heat transfer, gravity does not play any part?
Answer: According to thermodynamic systems, heat transfer is defined as the movement of heat across the border of the system... View Article
The temperature range upto which Newton’s law of cooling holds good
Newton’s law of cooling holds well upto 20-25°C.
Which of the given phenomena is not related to convection?
Formation of trade winds, land and sea breezes are phenomena related to convection whereas phenomenon in which metallic handle becomes... View Article
How is Mercury Heated?
Mercury is the only metal which is available in the liquid state. To heat the mercury, the conduction method is... View Article
What happens to the volume of the substance when the temperature increases?
When temperature of a substance increases, the molecules start moving vigorously in all directions, thus expanding and increasing the volume.
Phenomenon in which solid directly changes into vapour is called
Phenomenon in which solid directly changes into vapour is called sublimation.
A device in which heat measurement can be made is called
A device in which heat measurement can be made is called Calorimeter.
Choose the right answer from the following
The motion of a freely falling body is an example of_____. uniformly accelerated motion oscillating Motion rotary Motion linear Motion... View Article
Hydraulic brakes used in _______
Hydraulic brakes are used in vehicles like car, aeroplane, cranes etc. What are hydraulic brakes? The hydraulic brake is a... View Article
The formula used to find the pressure on a swimmer h metres below the surface of a lake is: (where Pa is the atmospheric pressure.)
The atmospheric pressure also needs to be added to find the total pressure on the swimmer. P = Pa +... View Article
Elastic limit point on the stress-strain curve appears
Elastic limit point appears before the proportionality limit point along the stress-strain curve.
