11645.Consider the following statements:
1. If magenta and yellow coloured circles intersect, the intersected area will have red colour.
2. If cyan and magenta coloured circles intersect, the intersected area will have blue colour.
Which of the statements given above is/are correct?
1. If magenta and yellow coloured circles intersect, the intersected area will have red colour.
2. If cyan and magenta coloured circles intersect, the intersected area will have blue colour.
Which of the statements given above is/are correct?
1 only
2 only
Both 1 and 2
Neither 1 nor 2
11646.Consider the following statements:
1. A flute of smaller length produces waves of lower frequency.
2. Sound travels in rocks in the form of longitudinal elastic waves only.
Which of the statements given above is/are correct?
1. A flute of smaller length produces waves of lower frequency.
2. Sound travels in rocks in the form of longitudinal elastic waves only.
Which of the statements given above is/are correct?
1 only
2 only
Both 1 and 2
Neither 1 nor 2
11647.Assertion (A): A jet aircraft moving at Mach Number equal to 1 travels faster at an altitude of 15 km than while moving at Mach Number equal to 1 near the sea level.
Reason (R): The velocity of sound depends on the temperature of the surrounding medium.
Reason (R): The velocity of sound depends on the temperature of the surrounding medium.
Both A are R are true and R is the correct explanation of A
Both A and R are true but R is not a correct explanation of A
A is true but R is false
A is false but R is true
11648.Consider the following phenomena:
1. Size of the sun at dusk.
2. Colour of the sun at dawn
3. Moon being visible at dawn
4. Twinkle of stars in the sky
5. Polestar being visible in the sky
Which of the above are optical illusions?
1. Size of the sun at dusk.
2. Colour of the sun at dawn
3. Moon being visible at dawn
4. Twinkle of stars in the sky
5. Polestar being visible in the sky
Which of the above are optical illusions?
1, 2 and 3
3, 4 and 5
1, 2 and 4
2, 3 and 5
11649.Rainbow is produced when sunlight falls on drops of rain. Which of the following physical phenomena are responsible for this?
1. Dispersion
2. Refraction
3. Internal reflection
Select the correct answer using the codes below.
1. Dispersion
2. Refraction
3. Internal reflection
Select the correct answer using the codes below.
1 and 2 only
2 and 3 only
1 and 3 only
1, 2 and 3
11650.During a thunderstorm, the thunder in the skies is produced by the
1. meeting of cumulonimbus clouds in the sky
2. lightning that separates the nimbus clouds
3. violent upward movement of air and water particles
Select the correct answer using the codes given below.
1. meeting of cumulonimbus clouds in the sky
2. lightning that separates the nimbus clouds
3. violent upward movement of air and water particles
Select the correct answer using the codes given below.
1 only
2 and 3
1 and 3
None of the above produces the thunder
11651.A fuse is used in mains electric supply as a safety device. Which one of the following statements about the fuse is correct?
It is connected in parallel with the main switch
It is made mainly from silver alloys
It must have a low melting point
It must have very high resistance
11652.Consider the following statements:
An ordinary light bulb has a rather short life because the:
1. filament wire is not uniform.
2. bulb cannot be evacuated completely.
3. wires supporting the filament melt at high
temperatures.
Which of the above statements are correct?
An ordinary light bulb has a rather short life because the:
1. filament wire is not uniform.
2. bulb cannot be evacuated completely.
3. wires supporting the filament melt at high
temperatures.
Which of the above statements are correct?
1 and 3
2 and 3
1 and 2
1, 2 and 3
11653.Consider the following statements regarding a motor car battery:
1. The voltage is usually 12 V.
2. Electrolyte used is hydrochloric acid.
3. Electrodes are lead and copper.
4. Capacity is expressed in ampere-hour.
Which of the above statements are correct?
1. The voltage is usually 12 V.
2. Electrolyte used is hydrochloric acid.
3. Electrodes are lead and copper.
4. Capacity is expressed in ampere-hour.
Which of the above statements are correct?
1 and 2
2 and 3
3 and 4
1 and 4
11654.Assertion (A): In our houses, the current in A.C. electricity line changes direction 60 times per second.
Reason (R): The frequency of alternating voltage supplied is 50 Hz.
Reason (R): The frequency of alternating voltage supplied is 50 Hz.
Both A and R are individually true and R is the correct explanation of A
Both A and R are individually true but R is not the correct explanation of A
A is true but R is false
A is false but R is true
11655.Graphene is frequently in news recently. What is its importance?
1. It is a two-dimensional material and has good electrical conductivity.
2. It is one of the thinnest but strongest materials tested so far.
3. It is entirely made of silicon and has high optical transparency.
4. It can be used as ‘conducting electrodes’ required for touch screens, LCDs and organic LEDs.
Which of the statements given above are correct?
1. It is a two-dimensional material and has good electrical conductivity.
2. It is one of the thinnest but strongest materials tested so far.
3. It is entirely made of silicon and has high optical transparency.
4. It can be used as ‘conducting electrodes’ required for touch screens, LCDs and organic LEDs.
Which of the statements given above are correct?
1 and 2 only
3 and 4 only
1, 2 and 4 only
1, 2, 3 and 4
11656.Electrically charged particles from space travelling at speeds of several hundred km/sec can severely harm living beings if they reach the surface of the Earth. What prevents them from reaching the surface of the Earth?
The Earth’s magnetic field diverts them towards its poles
Ozone layer around the Earth reflects them back to outer space
Moisture in the upper layers of atmosphere prevents them from reaching the surface of the Earth
None of the statements (a), (b) and (c) given above is correct
11657.The known forces of nature can be divided into four classes, viz., gravity, electromagnetism, weak nuclear force and strong nuclear force. With reference to them, which one of the following statements is not correct?
Gravity is the strongest of the four
Electromagnetism acts only on particles with an electric charge
Weak nuclear force causes radioactivity
Strong nuclear force holds protons and neutrons inside the nucleus of an atom
11658.With reference to SOLAR IMPULSE 2(Si2) statements:
1. Swiss explorers Bertrand Piccard and André Borschberg are the founders, pilots and driving force behind Solar Impulse, the first airplane of perpetual endurance, able to fly day and night without a drop of fuel.
2.The Round-The-World flight started from Abu Dhabi, on March 9. The route includes stop-overs in Oman, India, Myanmar and China. After trying to cross the Pacific Ocean via Hawaii, Si2 should fly across the U.S.A. and over the Atlantic Ocean, heading back to Abu Dhabi.
3. Si2 had arrived in Ahmedabad on March 10 after covering a distance of 1465 km from Muscat — it’s first stop in India and second in its global tour. In India it took off from the city of Indore for Myanmar.
Which of the statements given above is/are correct?
1. Swiss explorers Bertrand Piccard and André Borschberg are the founders, pilots and driving force behind Solar Impulse, the first airplane of perpetual endurance, able to fly day and night without a drop of fuel.
2.The Round-The-World flight started from Abu Dhabi, on March 9. The route includes stop-overs in Oman, India, Myanmar and China. After trying to cross the Pacific Ocean via Hawaii, Si2 should fly across the U.S.A. and over the Atlantic Ocean, heading back to Abu Dhabi.
3. Si2 had arrived in Ahmedabad on March 10 after covering a distance of 1465 km from Muscat — it’s first stop in India and second in its global tour. In India it took off from the city of Indore for Myanmar.
Which of the statements given above is/are correct?
1 and 3only
1 and 2 only
2 and 3 only
1, 2 and 3
11659.Which of the following physical phenomena are responsible for the formation of Rainbow when sunlight falls on drops of rain?
Refraction
Dispersion
Internal Reflection
All of the Above
11660.With reference to Sound waves consider the following statements:
1. Human ear is capable of detecting sound waves ranging between approximately 20 Hz to 20 000 Hz.
2. Sound waves in air are Transverse waves, where displacement of the medium is parallel to the propagation of the wave.
3. Sound generally travels faster in gases and liquids than in Solid.
Which of the statements given above is/are correct?
1. Human ear is capable of detecting sound waves ranging between approximately 20 Hz to 20 000 Hz.
2. Sound waves in air are Transverse waves, where displacement of the medium is parallel to the propagation of the wave.
3. Sound generally travels faster in gases and liquids than in Solid.
Which of the statements given above is/are correct?
1 only
1 and 2 only
2 and 3 only
1, 2 and 3
11661.For reproducing sound, a CD (Compact Disc) audio player uses a:
quartz crystal
titanium needle
laser beam
barium titanate ceramic
11662.Which one of the following does a TV remote control unit use to operate a TV set?
Light waves
Sound waves
Microwaves
Radio waves