Physics-Objective Related Question Answers
676. Why do an iron nail floats on mercury?
Density of mercury is lessthan the density of iron
677. Why a Ship moves from river to sea rises?
Density of sea water is greater than the little higher density of fresh water
678. Why It is impossible to extinguish fire due to petrol with water?
- Density of water is greater than the density of petrol. So petrol floats above the water and continue burning.
679. Why do Ice sinks in alcohol?
Density of water is greater than the density of alcohol.
680. Explain Pascal's law or also known as principle of Transmission of fluid pressure?
A force exerted on anywhere in a confined incompressible fluid is transmitted equally in all directions
681. Pascal's law was discovered by?
Blaise Pascal
682. The law that explains the working of Hydraulic Press is?
Pascal's law
683. The law that explains the working of Hydraulic jack is?
Pascal's law
684. The law that explains the working of Hydraulic lifts is?
Pascal's law
685. The law that explains the working of Flush tank is?
Pascal's law
686. When a body is immersed partly or wholly in a liquid, a force acts on the body by the liquid in the upward direction. This force is called?
Buoyant force [Example: A bucket of water weighs less when immersed in water]
687. State ARCHIMEDES PRINCIPLE?
When a body is completely or partly immersed in a fluid; the body experiences an upward thrust which is equal to the weight of fluid displaced by the body
688. The law of lever was proposed by?
Archimedes
689. The device used to test the purity of milk.?
Lactometer
690. The majority of UV radiations coming from the sun are absorbed by the?
Ozone layer
691. Periscopeisa device works on the principle of?
Reflection and Refraction
692. Photometry is the branch deals with the measurement of light emitted by the?
Objects
693. Father of cybernetics?
Norbert Weiner
694. Audible Frequency of sound of Human?
20Hz - 20000Hz
695. Frequency of sound Less than 20 Hz is?
Infrasonic
696. Frequency of sound Greater than 20000 Hz?
Ultrasonic
697. Tachyon was discovered by?
ECG Sudharshan
698. Wave theory was formulated by?
Christian Huygens
699. Quantum theory was formulated by -?
Max Planck
700. Corpuscular theory was formulated by?
Isaac Newton
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