Physics-Objective Related Question Answers
801. What is the use of Hygrometer?
To measure the humidity of atmosphere.
802. What is the use of Galvanometer?
To measure electric currents
803. What is the use of Microscope?
To magnify tiny objects
804. What is Lactometer?
device used to measure the relative density of milk to determine its purity
805. The device that uses radio waves to detect the position of objects such as Aeroplanes, missiles etc.?
Radar
806. What is Pyrometer?
Used to record high temperature from a great distance
807. What is Hydrophone?
It is used for recording of sound inside water
808. What is an electric oscillator?
It converts Direct Current into Alternating Current
809. What is cyclotron?
It is a device for producing high energy sub-atomic particles
810. What is Geiger - Muller counter?
It is used for detecting and measuring radio active radiation
811. What is a nuclear reactor?
It is the Central component of a nuclear power station; which generates nuclear energy under controlled conditions. What is the use of Microphone?
812. What is a hydrometer?
It is used for measuring the density of liquids directly.
813. What is venturimeter?
It is used for measuring flow of liquids
814. What is Radar?
Radar is Radio Detection and Ranging
815. When a force acting on a body produces displacement, it is called?
Work
816. What is called the capacity to do work?
Energy
817. Rate of doing work is called?
Power 1 horse power = 746 watt
818. Energy by virtue of which a body can do mechanical work is called?
Mechanical Energy
819. Which are the two forms of mechanical energy?
Kinetic energy & Potential energy
820. The energy possessed by a body because of its velocity is?
Kinetic energy
821. Kinetic energy is proportional to?
mass of the body & square of its velocity
822. The energy possessed by a body because of its position or change in shape is called?
Potential energy
823. What happens to the potential energy when the height of a body from the ground is doubled?
Potential energy is also doubled
824. The energy possessed by the water collected in the reservoir of a dam?
potential energy
825. If the velocity of a body is increased, its kinetic energy?
increases
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