Test : Physics - 6 - NDA MCQ

Power is the ratio of two scalar quatities, and is thus scalar quatities.

Pascal is not unit of Moment of Inertia. Moment of inertia may be expressed in units of kilogram metre squared (kg. m2) in SI units.

Atmospheric pressure is measured by Barometer.

Electric motors operating at low voltage tend to burn out because they draw more current which is inversely proportional to the voltage. 

The Pascal is SI unit of pressure.

The absorption of ink by blotting paper involves Capillary action phenomenon. 

Georges Claude invented Neon Lamp.

Strong nuclear force is the strongest force. It is present inside the atom responsible for binding the protons and neutrons and also inside the proton and neutron in binding up the quarks.

Heavy water is basically used as a moderator in nuclear reactors to slow down the neutrons so that they are captured and become effective to bring about the fission reaction

Jagdish Chandra Bose was elected as a fellow of the Royal Society of London for his contribution in the field of Plant Physiology and Physics. 

Steam burns are more serious than burns from boiling water even though both are at 100°C because when steam condenses it give up very high heat energy i.e. additional 22.6 × 〖10〗^6 joule of heat (latent that of vapourisation) compared to boiling water. 

The rays of light are scattered by the fog droplets due to which it become difficult to see through fog. 

Density of water is maximum at 4°C. 

Edwin Hubble gave the first evidence of the big-bang theory. 

The given situation can be shown as

By la w o f reflection , angle o f incidence i is equ al to angle o f r e fle c tio n r Total deviation of ray = 30° 4- 30° = 60°

To keep the outside heat away, windows of double-pane glass with air in between is the best choice because air is the bad conductor of heat. 

To keep the outside heat away, windows of double-pane glass with air in between is the best choice because air is the bad conductor of heat. 

Rocket works on the principle of conservation of linear momentum. 

In a pressure cooker while cooking pressure increases due to which boiling point of water also increases as P ∝ T.  

we know that momentum (p) = mv = .01 × 5 = .05kgm/s