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- Question 1 of 50
1. Question
Decibel is the unit used for:
Hint
Decibel (db) is the unit used for the intensity of sound. The ‘normal’ hearing frequency range of a healthy young person is about 20 to 20,000Hz. Though a ‘normal’ audible range for loudness is from 0 to 180dB, anything over 85dB is considered damaging.
- Question 2 of 50
2. Question
Conversion of chemical energy into electrical energy occurs in:
Hint
A battery is a DC voltage source that converts chemical energy to electrical energy. The chemical reactions in a battery involve the flow of electrons from one material (electrode) to another, through an external circuit.
- Question 3 of 50
3. Question
When was ISRO set up?
Hint
The Indian Space Research Organisation (ISRO) is the national space agency of India, headquartered in Bengaluru. ISRO was formed on 15 August 1969. Dr. Vikram A Sarabhai is considered as the founding father of space programmes in India.
- Question 4 of 50
4. Question
Which of the following pairs is not correct?
Hint
Isohyte is a line on a map connecting points having the same amount of rainfall in a given period. Isobar is a line on a map that joins places that have the same air pressure at a particular time. Isohel is a line on a map connecting points having the same duration of sunshine. Isotherm
a line on a map that joins places that have the same temperature at a particular time. - Question 5 of 50
5. Question
To an astronaut in a spacecraft, the sky appears to be:
Hint
The sky appears blue when the scattering of light takes place. As there is no atmosphere in space and hence light does not scatter into its constituent colors that is why the sky appears dark instead of blue to an astronaut in space.
- Question 6 of 50
6. Question
Metals are good conductors, because:
Hint
Metals are good conductors of electricity and heat because the atoms in the metals form a matrix through which outer electrons can move freely.
- Question 7 of 50
7. Question
Plimsoll line is a reference mark in a:
Hint
The Plimsoll line is a reference mark located on a ship’s hull that indicates the maximum depth to which the vessel may be safely immersed when loaded with cargo.
- Question 8 of 50
8. Question
In the process of dialysis, used on patients with affected kidneys, the phenomenon involved is:
Hint
Osmosis is the movement of water molecules from a solution with a high concentration of water molecules to a solution with a lower concentration of water molecules, through a cell’s partially permeable membrane. In dialysis, excess fluid moves from blood to the dialysate through a membrane until the fluid level is the same between blood and dialysate.
- Question 9 of 50
9. Question
Danger signals are generally red as red light:
Hint
Danger signs are red because air, water, and dust molecules scatter red light the least. Scattering has an inverse relationship with the fourth power of the wavelength of a particular colour. Because red has the longest wavelength of all the colours, it is the least dispersed.
- Question 10 of 50
10. Question
A simple microscope consists of:
Hint
A simple microscope is a magnifying glass that has a single or double convex lens with a short focal length.
- Question 11 of 50
11. Question
Which of the following produces more severe burns?
Hint
Steam produces more severe burns than boiling water. Steam at 100°C has more heat than water at the same temperature. Water gets converted into steam on gaining heat. Due to this latent heat of vaporisation, steam at 100°C is better for heating than boiling water at 100°C.
- Question 12 of 50
12. Question
The sudden fall of atmospheric pressure indicates:
Hint
When atmospheric pressure drops suddenly, this usually indicates that a storm is on its way. At the onset of a storm, low pressure occurs, which in turn would lead to rapid or violent movement of air from the high-pressure areas.
- Question 13 of 50
13. Question
Magnetism in materials is due to:
Hint
Magnetism in materials is due to circular motion of electrons. Magnetism is caused by the motion of electric charges. Every substance is made up of tiny units called atoms. Each atom has electrons, particles that carry electric charges. Spinning like tops, the electrons circle the nucleus, or core, of an atom.
- Question 14 of 50
14. Question
‘Short-sight’ in human eye can be corrected by using proper:
Hint
A concave lens is used to correct short-sightedness (myopia). A short-sighted person’s focus is focusing before the back of the eyeball. The concave lens pushes the rays of light further apart so that they arrive together in proper focus at the back of the eye.
- Question 15 of 50
15. Question
Who invented optical fibre?
Hint
Narinder Singh Kapany (1926 – 2020) was an Indian-American physicist best known for his work on fiber optics. He is credited with inventing fiber optics, and is considered the ‘Father of Fiber Optics’.
- Question 16 of 50
16. Question
A multimeter is used to measure:
Hint
A multimeter is a measuring instrument that can measure multiple electrical properties. A typical multimeter can measure voltage, resistance, and current.
- Question 17 of 50
17. Question
Diamonds are glittering and attractive because light incident on them undergoes:
Hint
Diamonds are glittering and attractive because light incident on them undergoes multiple internal reflections. Most of the light rays approaching the surface of a diamond are incident with an angle of incidence more than critical angle. Hence, they suffer multiple reflections and ultimately come out of diamond from the top. This gives the diamond a sparking brilliance.
- Question 18 of 50
18. Question
Which of the following is used to split white light into different colours?
Hint
Prism is used to split white light into different colours. Prisms are specially shaped so that light passing through them bends. Some colours bend more than others as they pass through the prism, so they split apart.
- Question 19 of 50
19. Question
Nuclear reactors used to produce electricity are based on:
Hint
All nuclear power plants use nuclear fission, and most nuclear power plants use uranium atoms. During nuclear fission, a neutron collides with a uranium atom and splits it, releasing a large amount of energy in the form of heat and radiation.
- Question 20 of 50
20. Question
Submerged objects can be located using:
Hint
Sonar (sound navigation and ranging) is an equipment or a system for finding objects underwater using sound waves.
- Question 21 of 50
21. Question
Which one of the following instruments is used to study the dispersion of light?
Hint
The separation of visible light into its different colors is known as dispersion. A spectrometer is used to study the dispersion of light. It is a device for measuring wavelengths of light over a wide range of the electromagnetic spectrum. It is widely used for spectroscopic analysis of sample materials.
- Question 22 of 50
22. Question
A fountain pen works on the principle of:
Hint
A fountain pen works on the principle of gravity and capillary action. Capillary action is the phenomenon where a liquid will automatically draw itself along a very thin tube.
- Question 23 of 50
23. Question
Pycnometer is an instrument used to measure the:
Hint
Pycnometers are used for measuring and comparing densities or specific gravities of liquids and solids, including soil.
- Question 24 of 50
24. Question
Fibre optics work on the principle of:
Hint
Fibre optics work on the principle of total internal reflection. Light travels down a fiber optic cable by bouncing off the walls of the cable repeatedly. Each light particle (photon) bounces down the pipe with continued internal mirror-like reflection. The light beam travels down the core of the cable.
- Question 25 of 50
25. Question
A decibel is:
Hint
Decibel (db) is the unit used for the intensity of sound. The ‘normal’ hearing frequency range of a healthy young person is about 20 to 20,000Hz. Though a ‘normal’ audible range for loudness is from 0 to 180dB, anything over 85dB is considered damaging.
- Question 26 of 50
26. Question
Remote-sensing device has an inbuilt source of:
Hint
Remote-sensing device (RSD) has an inbuilt source of infrared Ray. Remote sensing is a type of geospatial technology that samples emitted and reflected electromagnetic (EM) radiation from the Earth’s terrestrial, atmospheric, and aquatic ecosystems in order to detect and monitor the physical characteristics of an area without making physical contact.
- Question 27 of 50
27. Question
What material is used to make electric heater coil?
Hint
The most common material used for the heating element is Nichrome. Nichrome is the alloy of the Nickel and chromium; in this alloy, the nickel is 80% and the chromium is 20%. It is corrosion-resistant and has a high melting point of about 1400 degree C.
- Question 28 of 50
28. Question
The standard audible capacity of a healthy human being as per World Health Organisation is in the range of:
Hint
As per WHO The standard audible capacity of a healthy human being is in the range of 45-50 decibels. Humans can hear sounds between 0 and 180 decibels. To be precise, noise becomes harmful when it exceeds 75 decibels (dB) and is painful above 120 dB.
- Question 29 of 50
29. Question
An oil drop spreads over water because:
Hint
The surface tension of oil is less than cold water, and hence, oil spreads over cold water. However, the surface tension of oil is greater than that of hot water.
- Question 30 of 50
30. Question
The device which converts AC to DC is:
Hint
A rectifier is a special type of diode that converts alternating current (AC) into direct current (DC).
- Question 31 of 50
31. Question
What is colour of light related to?
Hint
Frequency determines color, but wavelength is the easier thing to measure. These wavelengths range from 700 nm at the red end of the spectrum to 400 nm at the violet end. Visible light waves are the only electromagnetic waves we can see.
- Question 32 of 50
32. Question
What principle/law explains the working of the hydraulic brakes in automobiles?
Hint
One of the most common examples of Pascal’s Law is the hydraulic braking system present in automobiles. According to this law when pressure is applied on fluid it travels equally in all directions so that uniform braking action is applied on all four wheels.
- Question 33 of 50
33. Question
The best conductor of heat among the following is:
Hint
Most metals are good conductors of heat as solid at room temperature. But mercury is the only good conductor of heat in a liquid state due to its high coefficient of expansion.
- Question 34 of 50
34. Question
What is viewed through an electron microscope?
Hint
Electron microscopes are used to investigate the ultrastructure of a wide range of biological and inorganic specimens including microorganisms, cells, large molecules, structure of bacteria and viruses, etc.
- Question 35 of 50
35. Question
What apparatus is used to locate a submerged object?
Hint
Sonar (sound navigation and ranging) is an equipment or a system for finding objects underwater using sound waves.
- Question 36 of 50
36. Question
Who invented the laser?
Hint
The word “laser” is an acronym for “light amplification by stimulated emission of radiation”. It was invented by the American engineer and physicist Theodore Harold Maiman in 1960.
- Question 37 of 50
37. Question
The instrument which uses sound waves to measure the depth of oceans is:
Hint
The instrument which uses sound waves to measure the depth of oceans is sonar. The word SONAR is an acronym for sound navigation and ranging. It can map the topography of the ocean floor. The device sends sound waves to the bottom of the ocean and measures how long it takes for an echo to return.
- Question 38 of 50
38. Question
When a bottle of scent is kept open in a corner of a room its odour is felt in all parts of the room. This is due to the phenomenon of:
Hint
Smells travel through the air by a process called diffusion; air particles, and the odour particles within the air, move freely in all directions. They are constantly moving and eventually they spread out through the air around them.
- Question 39 of 50
39. Question
Clear nights are colder than cloudy nights because of:
Hint
Clear nights are colder than cloudy nights because of radiation. Clouds warm the Earth by absorbing infrared radiation emitted from the surface and reradiating it back down.
- Question 40 of 50
40. Question
What is ‘Teletext’?
Hint
Teletext is a standard for displaying text and graphics on the TV screen. Teletext sends data in the broadcast signal, hidden in the invisible vertical blanking interval area at the top and bottom of the screen.
- Question 41 of 50
41. Question
Speed of sound is the greatest in:
Hint
Sound travels fastest through solids. This is because molecules in a solid medium are much closer together than those in a liquid or gas, allowing sound waves to travel more quickly through it. The speed of sound: in glass is 5640 m/s, in steel is 5960 m/s, in the air is 343 m/s and in water is 1452 m/s.
- Question 42 of 50
42. Question
A gas thermometer is more sensitive than a liquid thermometer because a gas:
Hint
Gas expands more than liquid for the same tiny change in temperature. Hence, gas thermometers are more sensitive than liquid thermometers.
- Question 43 of 50
43. Question
Which one of the following is used for sunglasses?
Hint
Crooks glass is used for sunglasses. Crooks glass mainly comprises of cerium oxide (CiO₂), which absorbs the ultraviolet radiation from the sun.
- Question 44 of 50
44. Question
Energy crisis is a consequence of:
Hint
The energy crisis is a result of many different strains on our natural resources. There is a strain on fossil fuels such as oil, gas, and coal due to overconsumption – which then, in turn, can put a strain on our water and oxygen resources by causing pollution.
- Question 45 of 50
45. Question
Good conductor of electricity is:
Hint
Dry air, paper and kerosene are bad conductors of electricity. Graphite is the one ‘allotropic form’ of carbon. In a graphite molecule, one valence electron of each carbon atom remains free. Therefore, graphite is a good conductor of electricity.
- Question 46 of 50
46. Question
Who invented Radar?
Hint
Robert Watson-Watt was a pioneer of radar technology. Although he did not invent the idea of radio detection, he was the first to prove it could work on a large scale. The world’s first true radar system was invented by an American electrical engineer Albert Hoyt Taylor and an American radio engineer Leo C Young.
- Question 47 of 50
47. Question
Which of the following is a nonrenewable source of energy?
Hint
A nonrenewable resource is a natural substance that is not replenished with the speed at which it is consumed. There are four major types of nonrenewable resources: oil, natural gas, coal, and nuclear energy. Oil, natural gas, and coal are collectively called fossil fuels.
- Question 48 of 50
48. Question
Solar energy is converted into chemical energy during:
Hint
Solar energy is converted into chemical energy during Photosynthesis. Photosynthesis is the conversion of solar energy (light energy from the Sun) into stored chemical energy (a form of glucose or other organic molecules).
- Question 49 of 50
49. Question
Which of the following is an important cause for global warming?
Hint
Global warming occurs when carbon dioxide (CO₂) and other air pollutants collect in the atmosphere and absorb sunlight and solar radiation that have bounced off the earth’s surface. The burning of fossil fuels is an important cause of global warming.
- Question 50 of 50
50. Question
What happens to atmospheric pressure with increase in altitude?
Hint
The density of air becomes heavier near the surface of the earth (due to gravity) and begins to lighten as we go to higher altitudes as the air becomes rarer. Thus, atmospheric pressure decreases with increase in altitude.