Question is ⇒ Planets do not twinkle because, Options are ⇒ (A) they emit light of a constant intensity, (B) their distance from the earth does not change with time, (C) they are very far away from the earth resulting in decrease in intensity of light, (D) they are nearer to earth and hence we receive a greater amount of light and, therefore minor variations in the intensity are not noticeable, (E) , Leave your comments or Download question paper.

Question is ⇒ Planets do not twinkle because, Options are ⇒ (A) they emit light of a constant intensity, (B) their distance from the earth does not change with time, (C) they are very far away from the earth resulting in decrease in intensity of light, (D) they are nearer to earth and hence we receive a greater amount of light and, therefore minor variations in the intensity are not noticeable, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	Planets do not twinkle because
A.	they emit light of a constant intensity [Wrong Answer]
B.	their distance from the earth does not change with time [Wrong Answer]
C.	they are very far away from the earth resulting in decrease in intensity of light [Wrong Answer]
D.	they are nearer to earth and hence we receive a greater amount of light and, therefore minor variations in the intensity are not noticeable [Correct Answer]
View Answer 2 -2 Explanation:- Answer : D Discuss it below : !! OOPS Login [Click here] is required to post your answer/result Help other students, write article, leave your comments

Previous question Next question

Also Read Similar Questions Below :

⇒ Four identical kettles with the same amount of water, have bases made of different metals of the same thickness. If these are placed on identical flames water will boil first in the kettle with a base made of
Brass
Copper
Aluminium
Steel

⇒ Sound travels at the fastest speed in
steel
water
air
vacuum

⇒ It is more difficult to walk on a sandy road than on a concrete road because
sand is soft and concreter is hard
the friction between sand and feet is less than that between concrete and feet
the friction between sand and feet is more than that between concrete and feet
the sand is grainy but concrete is smooth

⇒ Let a thin capillary tube be replaced with another tube of insufficient length then, we find water
will overflow
will not rise
depressed
change its meniscus

⇒ RADAR is used for
locating submerged submarines
receiving a signals in a radio receiver
locating geostationary satellites
detecting and locating the position of objects such as aeroplanes

⇒ Minimum number of unequal vectors which can give zero resultant are
two
three
four
more than four

⇒ MLTis the dimensional formula for
moment of inertia
pressure
elasticity
couple acting on a body

⇒ Stars twinkle because
the intensity of light emitted by them changes with time
the distance of the stars from the earth changes with time
the refractive index of the different layers of the earth's atmosphere changes continuously, consequently the position of the image of a start changes with time
the light from the star is scattered by the dust particles and air molecules in the earth's atmosphere

⇒ Mirage is due to
unequal heating of different parts of the atmosphere
magnetic disturbances in the atmosphere
depletion of ozone layer in the atmosphere
equal heating of different parts of the atmosphere

⇒ In which of the following industries is mica as a raw material?
Cement
Glass and Pottery
Iron and Steel
Electrical

⇒ Find the maximum velocity for the overturn of a car moving on a circular track of radius 100 m. The co-efficient of friction between the road and tyre is 0.2
0.14 m/s
140 m/s
1.4 km/s
14 m/s

⇒ A solid needle placed horizontally on the surface of the water floats due to
surface tension
capillary action
cohesion
adhesion

⇒ One should not connect a number of electrical appliances to the same power socket because
this can damage the appliances due to overloading
this can damage the domestic wiring due to overloading
this can damage the electrical meter
the appliance will not get full voltage

⇒ Radio telescopes are better than optical telescopes because
they can detect faint galaxies which no optical telescope can
they can work even in cloudy conditions
they can work during the day and night
All of the above

⇒ One nanometer is equal to
10-6m
10-8m
10-9m
10-5m

⇒ Superconductors are substances which
conduct electricity at low temperature
offer high resistance to the flow of current
offer no resistance to the flow of electricity
conduct electricity at high temperatures

⇒ On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because
mercury is a metal
density of mercury is greater than that of water
cohesion of mercury is greater than its adhesion with glass
cohesion of water is greater than its adhesion with glass

⇒ Optical fibre works on the
principle of refraction
total internal reflection
scattering
interference

⇒ Pick out the scalar quantity
force
pressure
velocity
acceleration

⇒ Out of the following, which is not emitted by radioactive substance?
Electrons
Electromagnetic radiations
Alpha particles
Neutrons

⇒ Sound of frequency below 20 Hz is called
audio sounds
infrasonic
ultrasonic
supersonics

⇒ An aeroplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically at a point A on the ground a bomb is released from it. The bomb strikes the ground at point B. The distance AB is
1200 m
0.33 km
3.33 km
33 km

⇒ A 100 watt bulb is kept on for a period of 10 hours per day in the month of September. The electrical energy consumed in that month in kilowatt hours (kwh) is
30 kwh
3 kwh
3000 kwh
1000 kwh

⇒ Rain is falling vertically downwards. To a man running east-wards, the rain will appear to be coming from
east
west
northeast
southeast

⇒ Out of the following pairs, which one does not have identical dimension?
Moment of inertia and moment of a force
Work and Torque
Angular momentum and Planck's constant
Impulse and Momentum

⇒ Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in
4.2 seconds
42 seconds
4.2 years
42 years

⇒ Light travels at the fastest speed in
glass
water
hydrogen
vacuum

⇒ Railway tracks are banked on curves
necessary centrifugal force may be obtained from the horizontal component weight of the train
to avoid frictional force between the tracks and wheels
necessary centripetal force may be obtained from the horizontal component of the weight of the train
the train may not fly off in the opposite direction

⇒ Rainbow is due to
absorption of sunlight in minute water droplets
diffusion of sunlight through water droplets
ionisation of water deposits
refraction and reflection of sunlight by water droplets

⇒ Sound produced at a point is heard by a person after 5 second, while the same sound is heard by another person after 6 seconds. If the speed of sound is 300 m/s, what could be the maximum and minimum distances between the two persons?
1.8 km, 0.15 km
2.2 km, 0.20 km
2.8 km, 0.25 km
3.3 km, 0.30 km