Category 6
A person who studies Physics
Physicist
SI unit of frequency
hertz
SI unit of heat
joule
one mega means
One million (= 1000 000 or 106)
What is absolute zero?
0K or -273 degree celcius
A pendulum makes 20 complete oscillations in 24.0 s.
Calculate its time period.
1.2 seconds
A wave doesn't transfer matter, it only transfers______
energy
Sound waves are produced by _____________
Vibrations
Speed of light in air is (approx)
300 000 km/s
Ultrasonics means ____________
Sound waves with frequency greater than 20 000 Hz
Loudness of a sound depends on______________
amplitude
Humans can hear frequencies between ________ to _________
20 Hz to 20000 Hz
Loudness of sound is measured in ________
decibels
Full form of SONAR
Sound Navigation and Ranging
Which type of retinal cells are responsible for color vision, and how many types of these cells are there?
Cone cells, 3 types of cone cells (RBG)
An example of a living luminous object
Firefly
Name the phenomenon responsible for the blue colour of the sky.
Scattering
Primary colours of light
RBG- Red, blue and green
What type of mirrors can form magnified image of an object?
Concave mirrors
What is the boiling point of water in kelvin?
373 K
Name the process of converting a solid directly to gas (without converting to liquid).
Sublimation
Name the mode of heat transfer that doesn't require a medium.
Radiation
If a light ray strikes a plane mirror along the normal, what will be the path of reflected ray?
The ray will retrace its path
Myopia can be treated by using________
concave lenses
An object is positioned 3 m from a plane mirror. How far will its image be from the object?
6 m