1. What is the difference between optical zoom, digital zoom and smart zoom?
optical zoom makes by lens over lens and digitalzoom act on lens with electronic component and power of chips
2. How does a basic rubber ink filler work?
first we press the ink filler it takes out the air. then we
release the filler there is some vaccum is created. so ink
is filled that vaccum space.
3. What is the proper definition of LIGHT?
light is a energy source that is used to see objects
clearer and easier to read and one example of the defanton
of light is if you turn on a flashlight in a dark room or a
lamp in a dark room or a fire in a cave or in a house.
4. WHICH ONE FEELS COLDER METAL SURFACES OR WOODEN SURFACES?
metal surface ,bcoz metal is agood conductor of heat
The answer is 5 hrs. The description is below.
D/72 + 1.0 = D/60
12 D = 72 x 60
D = 72 * 5 = 360 km
t= 360 / 72 = 5 hrs
7. Graph between frequency of photon and velocity of photo electron?
photon energy proportional to frequency
is given to electron as kinetic energy
which is proportional to square of velocity
graph will be parabolic
8. Name of the ten satellite launched from India and year of launch?
1. Aryabhata(1975)
2. Bhaskara-I(1979)
3. Bhaskara-II(1981)
4. APPLE(1981)
5. Rohini(1980)
6. IRS(1980)
7. INSAT(1982)
8. INSAT-2B(1993)
9. INSAT-2C(1995)
10.GSAT-I(2001)
9. What is the meaning of ‘steady state' in the context of transmission of heat?
It refers to heat flowing(transmitted) at a constant rate.
10. What is the melting point of copper?
copper melt at 1084 degrees
11. Which of the following would be the most suitable for making an electromagnet?
soft iron core is most suitable for making an electromagnet
12. The principle of action of points is used in ___________?
lightning arrestors
13. How we are getting light from electrical bulb?
shortly by thermionic emission the light bulb contains a
filament. this filament has a cathode and an anode. when we
switch on the bulb.then the cathode of the filament becomes
hot. due to this thermal electrons are ejected from the
cathode and move towards anode.on the path of electrons,
they make an elastic collision with the gas molecules
within the tube or filament. so the atoms of the gas are
raised to higher energy states. when these atoms dexcite
then light is emitted as predicted by Bohr theory
Emitter is highly doped whereas collector is moderately
doped.Width of collector region is most and that of emitter
is less than it.Charges moves from emitter to collector.
15. What is the difference between photodiode & photocell?
A photocell, also refered as a photoresistor has a resitance that depends on the intensity of light that is hitting it.
This is not the case for photodiodes, which light to current (or tension) conversion depends not on the intensity of light but on the operating mode : (photovoltaic zero biased for example)
H1N1 is a type of virus causing swine flu.
Ship displyed much more water as compared to its weight.
18. What is relation between magnetic and electricity and why?
magnet is produced the magnetic lines of forces.these lines are called magnetic flux.whenever varying magnetic flux linked with the coil, the induced emf is produced.this emf is called induced emf. the corresponding current is known as induced current.current is nothing but a electricity.
19. Why are metals able to conduct current so well?
because of the very small band gap between the valence band and the conduction band, making it very easy for electrons to go from one to another and be qualified as "free" electrons.
20. When taken to the top of a mountain, a clock will go fast or go slow or no change or stop?
The mountain clock will run faster IF COMPARED TO A SEA LEVEL CLOCK because the flow of TIME is Slowed by gravity and the gravity is slightly less on the mountain top. The flow of time affects ALL processes though, so compared to the (local) speed of light, or (any other mountain top measurement) the clock will appear to run exactly at the same rate. It is only a RELATIVE measurement (compared to the sea-level clock) that would show a different rate. The Scientists Pound-Rebka at Harvard University verified this effect with an atomic clock experiment. The effect would be WAY WAY too small to see with an ordinary clock though. It might take millions of years to see a one-second difference in two ordinary clocks.
21. Can a huge amount can be saved in a capacitor?
no. It depends on its storage capacity
22. What type(amount) of capacitors are used in fan?
fixed capacitors are used in fans.As you can see on the
capacitor by yourself. its capacitance is generally from
4-6 micro farad.variable capacitor is used in radio
23. Why is n-type conductor is neutral?
N-type semiconductors are prepared by doping pentavalent
atom (e.g. phosphorus) with the intrinsic semiconductor. we
know that atoms are neutral. out of five electron of P-atom
four makes covalent bond. one of the electron is only free
to move. it is remains in the material not escaping so the
n-type semiconductor material is neutral.
both travell same distance bcoz they tarvel with same speed
25. Direction of friction on a front and rear wheel of a bicycle when accelerated?
its direction is backward because of this friction the
moving object has non-zero net force and get acceleration.
26. What does quantity of matter in an object denote?
Mass of substance.
27. When a bar of iron is heated, it expands. What will happen to its weight when it is heated?
the weight remains the same as weight depends on mass and
acceleration due to gravity
W = m * g
as mass does not change and acceleration due to gravity does
not change so weight remains same
29. Explain application of optical fibers and sensors?
in communication,as sensors,endoscopes
A substance through which light can pass is called optical
medium e.g. air, water, glass.
When a substance possess the same properties at all points
and in all directions e.g. water.
In chemistry, heterogeneous mixture is a mixture of two or
more different substances in the form of solution or
colloids. For example, salad is an heterogeneous mixture
A heterogeneous mixture is a mixture that can be separated.
Here are some examples of heterogeneous mixtures
Sandy water
cake mix and cookie dough
sugar and salt mixed in a bowl
carbonated beverage or beer (the CO2 gas is mixed with the
liquid)
orange juice with pulp in it
water with ice cubes in it
chicken noodle soup
A substance which allows light to pass thought it but
through which allows light to pass through it easily and
through which objects can be seen distinctly is called
transparent e.g. glass, water.
It is a substance which allows light to pass through it
easily and through which objects cannot be seen clearly e.g.
ground glass, greased paper.
It is substance which does not allow any light to pass
thought it e.g. metal or stone.
Terms transparent and opaque are only relative terms as
there is no substance which is perfectly transparent or opaque.
