Stars twinkle but planets do not twinkle because (1) they emit light of a constant intensity (2) their distance from the earth does not change with time (3) they are very far away from the earth resulting in decrease in intensity of light (4) they are nearer to the earth and hence we receive a greater amount of light and therefore minor variations in intensity are not noticeable

Stars twinkle but planets do not twinkle because (1) they emit light of a constant intensity (2) their distance from the earth does not change with time (3) they are very far away from the earth resulting in decrease in intensity of light (4) they are nearer to the earth and hence we receive a greater amount of light and therefore minor variations in intensity are not noticeable 
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they are nearer to the earth and hence we receive a greater amount of light and therefore minor variations in intensity are not noticeable
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Stars twinkle but planets do not twinkle because – (1) they emit light of a constant intensity (2) their distance from the earth does not change with time (3) they are very far away from the earth resulting in decrease in intensity of light (4) they are nearer to the earth and hence we receive a greater amount of light and therefore minor variations in intensity are not noticeable

Description : Stars twinkle but planets do not twinkle because - (1) they emit light of a constant intensity (2) their distance from the earth does not change with time (3) they are very far away ... and hence we receive a greater amount of light and therefore minor variations in intensity are not noticeable

Last Answer : (4) they are nearer to the earth and hence we receive a greater amount of light and therefore minor variations in intensity are not noticeable Explanation: Eris is the most massive and second-largest ... orbiting the Sun, and the largest known body in the Solar System not visited by a spacecraft.

Planets do not twinkle because they (a) emit light continuously (b) are luminous sources of light (c) are nearer to us and therefore their light does not pass through the atmosphere (d) are nearer to us and therefore minor variations in their intensity are not noticeable

Description : Planets do not twinkle because they (a) emit light continuously (b) are luminous sources of light (c) are nearer to us and therefore their light does not pass through the atmosphere (d) are nearer to us and therefore minor variations in their intensity are not noticeable

Last Answer : Ans:(d)

The heavenly bodies that do not twinkle are called ………………. . (a) planets (b) stars (c) rockets

Description : The heavenly bodies that do not twinkle are called ………………. . (a) planets (b) stars (c) rockets

Last Answer : (a) planets

Pulsars are (1) stars moving towards the Earth (2) stars moving away from Earth (3) rapidly spinning stars (4) high temperature stars

Description : Pulsars are (1) stars moving towards the Earth (2) stars moving away from Earth (3) rapidly spinning stars (4) high temperature stars 

Last Answer :  rapidly spinning stars

People living at sea level have around 5 million RBC per cubic millimeter of their blood whereas those living at an altitude to 5400 metres have around 8 million. This is because at high altitude (a) people eat more nutritive food, therefore more RBCs are formed (b) people get pollution-free air to breath and more oxygen is available (c) atmospheric O2 level is less and hence more RBCs are needed to absorb the required amount of O2 to survive (d) there is more UV radiation which enhances RBC production.

Description : People living at sea level have around 5 million RBC per cubic millimeter of their blood whereas those living at an altitude to 5400 metres have around 8 million. This is because at high altitude ... required amount of O2 to survive (d) there is more UV radiation which enhances RBC production.

Last Answer : (c) atmospheric O2 level is less and hence more RBCs are needed to absorb the required amount of O2 to survive

Where are the hot deserts generally found ? (1) On the eastern margins of the Tropics (2) On the western margins of the Tropics (3) Nearer the Equator (4) In the middle of the Continents

Description : Where are the hot deserts generally found ? (1) On the eastern margins of the Tropics (2) On the western margins of the Tropics (3) Nearer the Equator (4) In the middle of the Continents 

Last Answer : On the western margins of the Tropics

Why are there jets in the midlatitudes in the upper troposphere? (a) Air is warmer in the tropics than the poles, resulting in a poleward pressure gradient that increases with increasing height. (b) Because air near the surface experiences the drag of surface friction, while air in the upper troposphere does not. (c) Due to variations in temperature between continents and ocean. (d) Due to the constant bending by the Coriolis force. (e) Both A and D are correct.

Description : Why are there jets in the midlatitudes in the upper troposphere? (a) Air is warmer in the tropics than the poles, resulting in a poleward pressure gradient that increases with increasing height. (b) Because ... d) Due to the constant bending by the Coriolis force. (e) Both A and D are correct.

Last Answer : (e) Both A and D are correct.

A hollow sphere and a solid sphere of the same material and equal radii are heated to the same temperature. In this case, (A) The cooling rate will be the same for the two spheres and hence the two spheres will have equal temperatures at any instant (B) Both the spheres will emit equal amount of radiation per unit time in the beginning (C) Both will absorb equal amount of radiation from the surrounding in the beginning (D) Both (B) & (C)

Description : A hollow sphere and a solid sphere of the same material and equal radii are heated to the same temperature. In this case, (A) The cooling rate will be the same for the two spheres and hence the ... equal amount of radiation from the surrounding in the beginning (D) Both (B) & (C)

Last Answer : (D) Both (B) & (C)

The heavenly bodies that twinkle are called ……………………. . (a) earth (b) moon (c) stars

Description : The heavenly bodies that twinkle are called ……………………. . (a) earth (b) moon (c) stars

Last Answer : (c) Stars

The planets on either side of the Earth are (1) Mars and Jupiter (2) Mercury and Venus (3) Venus and Saturn (4) Mars and Venus

Description : The planets on either side of the Earth are (1) Mars and Jupiter (2) Mercury and Venus (3) Venus and Saturn (4) Mars and Venus

Last Answer : Mars and Venus

On which of the following planets water cycle is available ? (1) Jupiter (2) Earth (3) Mars (4) Venus

Description : On which of the following planets water cycle is available ? (1) Jupiter (2) Earth (3) Mars (4) Venus

Last Answer : Jupiter

Sea water is saltier than rain water because (1) rivers wash away salts from earth and pour them into the sea (2) sea beds have salt producing mines (3) sea animals are salt producing (4) the air around the sea is saltish

Description : Sea water is saltier than rain water because (1) rivers wash away salts from earth and pour them into the sea (2) sea beds have salt producing mines (3) sea animals are salt producing (4) the air around the sea is saltish 

Last Answer : rivers wash away salts from earth and pour them into the sea

Mark the correct answer (a) Planets have an apparent motion and twinkle (b) Planets have no apparent motion but twinkle (c) Planets have an apparent motion but do not twinkle (d) Planets have no apparent motion and do not twinkle

Description : Mark the correct answer (a) Planets have an apparent motion and twinkle (b) Planets have no apparent motion but twinkle (c) Planets have an apparent motion but do not twinkle (d) Planets have no apparent motion and do not twinkle

Last Answer : Ans:(c)

Suppose if we measure the time lapse between the two Sunsets by sitting in the beach, from this we can estimate (1) The distance between the sun and the earth (2) The depth of the ocean (3) The radius of the earth (4) The radius of the sun

Description : Suppose if we measure the time lapse between the two Sunsets by sitting in the beach, from this we can estimate (1) The distance between the sun and the earth (2) The depth of the ocean (3) The radius of the earth (4) The radius of the sun

Last Answer :  The radius of the earth

Planets are (a) luminous bodies that twinkle (b) non-luminous bodies that twinkle (c) luminous bodies that do not twinkle (d) non-luminous bodies that do not twinkle

Description : Planets are (a) luminous bodies that twinkle (b) non-luminous bodies that twinkle (c) luminous bodies that do not twinkle (d) non-luminous bodies that do not twinkle

Last Answer : Ans:(d)

Planets 1. are luminous bodies 2. twinkle 3. are non-luminous bodies 4. do not twinkle Which of the above statements is/are correct? (a) 1 and 2 (b) 1 and 4 (c) 2 and 3 (d) 3 and 4

Description : Planets 1. are luminous bodies 2. twinkle 3. are non-luminous bodies 4. do not twinkle Which of the above statements is/are correct? (a) 1 and 2 (b) 1 and 4 (c) 2 and 3 (d) 3 and 4

Last Answer : Ans:(d)

If speed of rotation of the earth increases, the weight of the body (1) decreases (2) increases (3) remains the same (4) may increase or decrease

Description : If speed of rotation of the earth increases, the weight of the body (1) decreases (2) increases (3) remains the same (4) may increase or decrease

Last Answer : decreases

Why do stars twinkle more on certain nights, compared to others?

Description : Why do stars twinkle more on certain nights, compared to others?

Last Answer : My understanding is that the particulate matter in the various layers of earth's atmosphere get in the path of the photons traveling toward us; the twinkling is the particles briefly diffracting ... is little-to no twinkling effect as there are far fewer particles in zero atmospheric conditions.

Why do the stars twinkle in the sky? -General Knowledge

Description : Why do the stars twinkle in the sky? -General Knowledge

Last Answer : answer:

Stars in the sky appear to twinkle due to – (1) a series of refractions (2) a series of reflections (3) a surface tension phenomenon (4) multiple diminishing brightness

Description : Stars in the sky appear to twinkle due to – (1) a series of refractions (2) a series of reflections (3) a surface tension phenomenon (4) multiple diminishing brightness

Last Answer : (1) a series of refractions Explanation: The movement of air (sometimes called turbulence) in the atmosphere of Earth causes a series of refractions which makes the starlight to get slightly bent as it ... directly and some gets bent slightly away. To our eyes, this makes the star seem to twinkle.

Why do the stars twinkle?

Description : Why do the stars twinkle?

Last Answer : Ans: The light from the stars travels through different layers of space of varying densities. Therefore, the light rays deviate from their original path. Further, these layers are not stationary but keep on moving. This leads to the twinkling of stars.

Stars in the sky appear to twinkle due to (1) a series of refractions (2) a series of reflections (3) a surface tension phenomenon (4) multiple diminishing brightness

Description : Stars in the sky appear to twinkle due to (1) a series of refractions (2) a series of reflections (3) a surface tension phenomenon (4) multiple diminishing brightness 

Last Answer : a series of refractions

Do stars emit of reflect light?

Description : Do stars emit of reflect light?

Last Answer : They emit their own light.

The total number of planets revolving around the sun is (1) Five (2) Eight (3) Seven (4) Six

Description : The total number of planets revolving around the sun is (1) Five (2) Eight (3) Seven (4) Six

Last Answer : Eight

Which planets do not have satellites revolving around them ? (1) Mars and Venus (2) Mercury and Venus (3) Mars and Mercury (4) Neptune and Pluto

Description : Which planets do not have satellites revolving around them ? (1) Mars and Venus (2) Mercury and Venus (3) Mars and Mercury (4) Neptune and Pluto

Last Answer : Mercury and Venus

Which of the following does not belong to the solar system? (1) Asteroids (2) Comets (3) Planets (4) Nebulae

Description : Which of the following does not belong to the solar system? (1) Asteroids (2) Comets (3) Planets (4) Nebulae

Last Answer : Nebulae

The four largest planets of the Solar System in decreasing size are (1) Jupiter, Mercury, Saturn and Uranus (2) Mercury, Jupiter, Saturn and Neptune (3) Jupiter, Saturn, Uranus and Neptune (4) Jupiter, Mercury, Saturn and Neptune

Description : The four largest planets of the Solar System in decreasing size are (1) Jupiter, Mercury, Saturn and Uranus (2) Mercury, Jupiter, Saturn and Neptune (3) Jupiter, Saturn, Uranus and Neptune (4) Jupiter, Mercury, Saturn and Neptune

Last Answer : Jupiter, Saturn, Uranus and Neptune

Which one of the following planets has no moon? (1) Mars (2) Neptune (3) Mercury (4) Pluto

Description : Which one of the following planets has no moon? (1) Mars (2) Neptune (3) Mercury (4) Pluto

Last Answer : Mercury

Which amidst the following planets has its orbit closest to Sun ? (1) Venus (2) Mars (3) Jupiter (4) Uranus

Description : Which amidst the following planets has its orbit closest to Sun ? (1) Venus (2) Mars (3) Jupiter (4) Uranus

Last Answer : Venus

Airmass near to the earth’s surface is warmer because it (1) radiates heat (2) contains dust particles (3) is warmed by terrestrial radiation (4) is far from the sun

Description : Airmass near to the earth’s surface is warmer because it (1) radiates heat (2) contains dust particles (3) is warmed by terrestrial radiation (4) is far from the sun

Last Answer : is warmed by terrestrial radiation

If K is a constant depending upon the ratio of the width of the slab to its effective span l, x is the distance of the concentrated load from the nearer support, bw is the width of the area of contact of the concentrated load measured parallel to the supported edge, the effective width of the slab be is (A) K/x (1 + x/d) + bw (B) Kx (1 - x/l) + bw (C) Kx (1 + x/l) + bw (D) All the above

Description : If K is a constant depending upon the ratio of the width of the slab to its effective span l, x is the distance of the concentrated load from the nearer support, bw is the width of the area of contact of the concentrated load measured ... ) Kx (1 - x/l) + bw (C) Kx (1 + x/l) + bw (D) All the above

Last Answer : Answer: Option B

Light travels faster in a material with a lower refractive index. Therefore, light rays that travel a longer distance in a lower refractive index travel at a greater average velocity. What effect does this have on multimode graded-index fiber modal dispersion and bandwidth?

Description : Light travels faster in a material with a lower refractive index. Therefore, light rays that travel a longer distance in a lower refractive index travel at a greater average velocity. What effect does this have on multimode graded-index fiber modal dispersion and bandwidth?

Last Answer : Decreases the time difference between light rays, which reduces modal dispersion and increases fiber bandwidth.

What is the position of the Earth when it is at the greatest distance from the sun ? (1) Aphelion (2) Antipode (3) Perihelion (4) Aldiate

Description : What is the position of the Earth when it is at the greatest distance from the sun ? (1) Aphelion (2) Antipode (3) Perihelion (4) Aldiate

Last Answer : Aphelion

When the earth is at the maximum distance from the Sun, it is called (1) Aphelion (2) Perihelion (3) Equinox (4) Sidereal

Description : When the earth is at the maximum distance from the Sun, it is called (1) Aphelion (2) Perihelion (3) Equinox (4) Sidereal

Last Answer : Aphelion

The latitude of a place is expressed by its angular distance in relation to— (1) Equator (2) South Pole (3) Axis of the Earth (4) North Pole

Description : The latitude of a place is expressed by its angular distance in relation to— (1) Equator (2) South Pole (3) Axis of the Earth (4) North Pole

Last Answer : Equator

What is the epicentre of an Earthquake? (1) The point at which earthquake originates (2) The point which is prone to volcanoes (3) The point from which the intensity of seismic waves declines (4) The point on the earth’s surface vertically above the seismic focus

Description : What is the epicentre of an Earthquake? (1) The point at which earthquake originates (2) The point which is prone to volcanoes (3) The point from which the intensity of seismic waves declines (4) The point on the earth’s surface vertically above the seismic focus

Last Answer : The point on the earth’s surface vertically above the seismic focus

The scale that measures the intensity of earthquakes is called as (1) Vernier scale (2) Richter scale (3) Beaufort scale (4) Diagonal scale

Description : The scale that measures the intensity of earthquakes is called as (1) Vernier scale (2) Richter scale (3) Beaufort scale (4) Diagonal scale

Last Answer : Richter scale

What is the scale used for measuring the intensity of the earthquake? (1) Richter scale (2) Metric scale (3) Centigrade scale (4) Newton’s scale

Description : What is the scale used for measuring the intensity of the earthquake? (1) Richter scale (2) Metric scale (3) Centigrade scale (4) Newton’s scale

Last Answer : Richter scale

The temperature of water at the bottom of a large waterfall is higher than that of the water at the top. because (1) the falling water absorbs heat from the Sun. (2) the water at the bottom has greater potential energy. (3) the kinetic energy of the falling water is converted into heat. (4) rocks on the bed of the river give out heat.

Description : The temperature of water at the bottom of a large waterfall is higher than that of the water at the top. because (1) the falling water absorbs heat from the Sun. (2) the water at the bottom has greater ... of the falling water is converted into heat. (4) rocks on the bed of the river give out heat.

Last Answer : the kinetic energy of the falling water is converted into heat.

Extensive deserts occur in the western tropical regions of continents because : (1) of easterly trade winds. (2) cold ocean currents flow along the western coasts. (3) of the effect of both the offshore easterly trade winds and cold ocean currents. (4) the rate of evaporation is greater along the western margin areas.

Description : Extensive deserts occur in the western tropical regions of continents because : (1) of easterly trade winds. (2) cold ocean currents flow along the western coasts. (3) of the effect of both the ... winds and cold ocean currents. (4) the rate of evaporation is greater along the western margin areas.

Last Answer :  of the effect of both the offshore easterly trade winds and cold ocean currents. 

The amount of insolation received at a place on the surface of the earth depends upon: (1) its climate (2) the longitude of the place (3) its latitude (4) the altitude of the place

Description : The amount of insolation received at a place on the surface of the earth depends upon: (1) its climate (2) the longitude of the place (3) its latitude (4) the altitude of the place

Last Answer : its latitude

The freezer in a refrigerator is fitted near the top – (1) to keep it away from hot compressor which is nearer to the bottom (2) because of convenience (3) it facilitates convection currents (4) to minimise power consumption

Description : The freezer in a refrigerator is fitted near the top – (1) to keep it away from hot compressor which is nearer to the bottom (2) because of convenience (3) it facilitates convection currents (4) to minimise power consumption

Last Answer : (3) it facilitates convection currents Explanation: The freezer in a refrigerator is fitted near the top so that it can cool the whole interior by setting up ... compartment temperature excessively causes difficulties in maintaining above-reezing temperature in the refrigerator compartment.

The freezer in a refrigerator is fitted near the top (1) to keep it away from hot compressor which is nearer to the bottom (2) because of convenience (3) it facilitates convection currents (4) to minimise power consumption

Description : The freezer in a refrigerator is fitted near the top (1) to keep it away from hot compressor which is nearer to the bottom (2) because of convenience (3) it facilitates convection currents (4) to minimise power consumption

Last Answer : it facilitates convection currents

The danger signals are red while the eye is more sensitive to yellow because – (1) absorption in red is less than yellow and hence red is visible from a distance (2) scattering in yellow light is less than red (3) the wavelength of red light is more than yellow light (4) none of the above reasons

Description : The danger signals are red while the eye is more sensitive to yellow because – (1) absorption in red is less than yellow and hence red is visible from a distance (2) scattering in yellow light is less than red (3) the wavelength of red light is more than yellow light (4) none of the above reasons

Last Answer : (3) the wavelength of red light is more than yellow light

How to determine the distance between planets and stars ?

Description : How to determine the distance between planets and stars ?

Last Answer : The distance between planets and stars can be determined with the information about how long it takes for a particle of light to reach that planet . Example: Given , it takes time for light to travel from Earth ... km Sutarang, the distance between the Earth and the Moon : 552 meters

Pick up the incorrect statement from the following. Intake of water supply should (A) Be nearer to the treatment plant (B) Receive water from purer zone of the source (C) Be located downstream of waste water disposal point (D) Remain easily accessible during floods

Description : Pick up the incorrect statement from the following. Intake of water supply should  (A) Be nearer to the treatment plant  (B) Receive water from purer zone of the source  (C) Be located downstream of waste water disposal point  (D) Remain easily accessible during floods 

Last Answer : (C) Be located downstream of waste water disposal point 

The light from the Sun reaches the Earth in about— (1) 8 seconds (2) 8 minutes (3) 10 seconds (4) 10 minutes

Description : The light from the Sun reaches the Earth in about— (1) 8 seconds (2) 8 minutes (3) 10 seconds (4) 10 minutes

Last Answer : 8 minutes

Why are winters more severe in Southern Hemisphere than in Northern Hemisphere? (1) Earth is titled towards the sun in the Northern Hemisphere (2) Northern Hemisphere receives more sunlight (3) Because of more iceberg activity in Southern Hemisphere (4) Southern Hemisphere is less inhabited

Description : Why are winters more severe in Southern Hemisphere than in Northern Hemisphere? (1) Earth is titled towards the sun in the Northern Hemisphere (2) Northern Hemisphere receives more sunlight (3) Because of more iceberg activity in Southern Hemisphere (4) Southern Hemisphere is less inhabited

Last Answer : Earth is titled towards the sun in the Northern Hemisphere

The moon is showing its same face to the earth because (1) It is not rotating about its own axis (2) Its rotation and revolution are opposite (3) Its periods of rotation and revolution are the same (4) Its rotation is faster than its revolution

Description : The moon is showing its same face to the earth because (1) It is not rotating about its own axis (2) Its rotation and revolution are opposite (3) Its periods of rotation and revolution are the same (4) Its rotation is faster than its revolution

Last Answer : Its periods of rotation and revolution are the same