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Physics Quiz 3

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  1. Question 1 of 50
    1. Question

    A person can jump higher on the Moon’s surface than on the Earth because:

    Hint

    Earth’s gravity is 6 times the moon’s gravity. It means the gravitational pull on the moon is very small. Hence, a person can jump higher on the Moon’s surface than on the Earth.

  2. Question 2 of 50
    2. Question

    The purpose of choke in a fluorescent lamp is:

    Hint

    The function of the choke is to provide high voltage initially between the filaments (across the two ends of the tube light) for ionization. Again once the gas in the tube is ionized the choke limits the current flow across the tube.

  3. Question 3 of 50
    3. Question

    The apparent weight of a man in a lift is less than the real weight when:

    Hint

    The apparent weight of a man in a lift is less than the real weight when the lift is going down with an acceleration. When a lift accelerates upwards, the apparent weight of the person inside it increases; and when a lift accelerates downwards, the apparent weight of the person inside it decreases.

  4. Question 4 of 50
    4. Question

    Rainbows are produced when sunlight:

    Hint

    When sunlight incident on raindrops formation of a Rainbow occurs in the sky. These raindrops work as a prism. When sunlight hits a raindrop, some of the light is reflected. The electromagnetic spectrum is made of light with many different wavelengths, and each is reflected at a different angle. Thus, spectrum is separated, producing a rainbow.

  5. Question 5 of 50
    5. Question

    The velocity of sound in moist air is more than in dry air because the moist air has:

    Hint

    When the medium is dense, the molecules in the medium are closely packed, which means that the sound travels faster. Therefore, the speed of sound increases as the density of the medium increases.

  6. Question 6 of 50
    6. Question

    The least penetrating power ray is:

    Hint

    The penetrating power is the amount of energy that is absorbed depending on the type of radiation and the type of absorbing material. Alpha Rays have the least penetrating power as they are massive in nature. Gamma rays are the most penetrating of all the radiations.

  7. Question 7 of 50
    7. Question

    X-rays can be used:

    Hint

    X-ray inspection systems are mostly capable of detecting defects and contaminants in precious stones and diamonds.

  8. Question 8 of 50
    8. Question

    Ice is packed in sawdust because:

    Hint

    Ice is packed in sawdust because it is a poor conductor of heat. The air filled in the fine pores of sawdust is an insulator of heat. This air does not allow heat from outside to pass to the ice thereby preventing its melting.

  9. Question 9 of 50
    9. Question

    It is easy to burst a gas-filled balloon with a needle than with a nail. It is because:

    Hint

    If the force is held constant the pressure is inversely proportional to the area (Pressure = force/area). Here area of the nail is much greater than the area of the needle. Thus, needle exerts more pressure than nail on the balloon.

  10. Question 10 of 50
    10. Question

    Electric current is measured using which of the following instrument?

    Hint

    Ammeter is an instrument for measuring either direct or alternating electric current, in amperes.

  11. Question 11 of 50
    11. Question

    The dynamo converts:

    Hint

    The dynamo converts mechanical energy into electrical energy. The dynamo is made up of stationary magnets (stator) which create a powerful magnetic field, and a rotating magnet (rotor) which distorts and cuts through the magnetic lines of flux of the stator. When the rotor cuts through lines of magnetic flux it makes electricity.

  12. Question 12 of 50
    12. Question

    A fuse wire is characterized by:

    Hint

    A fuse wire is characterized by high resistance and low melting point. As a high amount of current is passing, resistances of the fuse wire have to be large due to which the heat produced will be high and it is broken down immediately.

  13. Question 13 of 50
    13. Question

    A missile is launched with a velocity less than escape velocity. The sum of its kinetic and potential energies is:

    Hint

    The sum of kinetic energy and potential energy is negative. This is because for the velocity less than escape velocity the missile is bounded due to the gravitational field of the earth. Hence its total energy is negative.

  14. Question 14 of 50
    14. Question

    Cyanide poisoning causes death in seconds because:

    Hint

    Cyanide breaks the electron transport chain (ETC) in human body. ETC is found within the mitochondria of living cells. It is the last component of aerobic respiration and is the only part of glucose metabolism that uses atmospheric oxygen. Cyanide prevents the cells of the body from using oxygen.

  15. Question 15 of 50
    15. Question

    When one gene pair hides the effect of the other unit. The phenomenon is referred to as:

    Hint

    When one gene pair hides the effect of another gene pair it is known as Epistasis. Epistasis is a circumstance where the expression of one gene is affected by the expression of one or more independently inherited genes.

  16. Question 16 of 50
    16. Question

    To an astronaut in space the sky will appear 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.

  17. Question 17 of 50
    17. Question

    On a rainy day, small oil films on water show brilliant colours. This is due to:

    Hint

    On a rainy day, due to the Interference of light, small oil films on water show brilliant colours. Interference is a phenomenon in which two waves superimpose to form a resultant wave of the greater, lower, or same amplitude.

  18. Question 18 of 50
    18. Question

    Rainbow formation is due to:

    Hint

    When sunlight incident on raindrops formation of a Rainbow occurs in the sky. These raindrops work as a prism. When sunlight hits a raindrop, some of the light is reflected. The electromagnetic spectrum is made of light with many different wavelengths, and each is reflected at a different angle. Thus, spectrum is separated, producing a rainbow.

  19. Question 19 of 50
    19. Question

    The total energy of an electron inside an atom is:

    Hint

    The total energy of an electron in an atom in an orbit is −3.4eV. The total energy is the sum of the electron’s kinetic energy (3.4 eV) and the potential energy (-6.8 eV) coming from the electron-proton interaction.

  20. Question 20 of 50
    20. Question

    The velocity of light is:

    Hint

    Speed of light in air is 3×108 m/s and speed of light in common glass is 2×108 m/s.

  21. Question 21 of 50
    21. Question

    What is the time period of a pendulum clock?

    Hint

    A pendulum clock is a clock that uses a pendulum, a swinging weight, as its timekeeping element. It swings back and forth in a precise time interval. A pendulum clock takes 1 second to move from one extreme to the other extreme, so its time period is 2 seconds.

  22. Question 22 of 50
    22. Question

    A jug is filled to the brim with water at 0°C. A piece of ice floats in it. The moment the ice melts:

    Hint

    When the ice was floating, the volume of water displaced had a mass equal to that of ice. After melting, that mass of ice has been converted into water. Therefore, there is no change in water level.

  23. Question 23 of 50
    23. Question

    Herman Hollerith had perfected his tabulating system and developed a machine called:

    Hint

    Herman Hollerith (1860-1929) was a German-American statistician, inventor, and businessman. He was the inventor of the punched card tabulating machine—the precursor of the modern computer—and one of the founders of modern information processing. His machine was used to gather information for the 1890 census more efficiently.

  24. Question 24 of 50
    24. Question

    Absorption of water from cut ends of stems disproves the:

    Hint

    Absorption of water from cut ends of stems disproves the Root pressure theory. Root pressure is a force that helps to drive fluids upward into the water-conducting vessels (xylem). It is primarily generated by osmotic pressure in the cells of the roots and can be demonstrated by exudation of fluid when the stem is cut off just aboveground.

  25. Question 25 of 50
    25. Question

    The loss of water in the form of water droplets is called:

    Hint

    The loss of water in the form of water droplets is called guttation. Guttation is the exudation of drops of xylem sap on the tips or edges of leaves of some vascular plants, such as grasses, and a number of fungi.

  26. Question 26 of 50
    26. Question

    The metal used for making aircraft and rockets is:

    Hint

    Aluminium and its alloys are used for making aircraft and rockets, due to their high strength at relatively low density.

  27. Question 27 of 50
    27. Question

    The colours of stars depend on their:

    Hint

    Stars have different colors, which are indicators of temperature. The hottest stars tend to appear blue or blue-white, whereas the coolest stars are red.

  28. Question 28 of 50
    28. Question

    Radar is used to:

    Hint

    Radar is an electromagnetic sensor used for detecting, locating, tracking, and recognizing objects of various kinds at considerable distances. It operates by transmitting electromagnetic energy toward objects, commonly referred to as targets, and observing the echoes returned from them.

  29. Question 29 of 50
    29. Question

    Optical fibre works on the principle of:

    Hint

    Optical fibre works on the principle of total internal reflection. When light ray strikes at the internal surface of an optical fibre cable called such that incidence angle is greater than critical angle, then incident light ray reflects in the same medium and this phenomenon repeats.

  30. Question 30 of 50
    30. Question

    Radiocarbon Dating is used to estimate the age of:

    Hint

    Radiocarbon Dating (carbon-14 dating) is used to estimate the age of fossils. It is a method of age determination that depends upon the decay to nitrogen of radiocarbon (carbon-14).

  31. Question 31 of 50
    31. Question

    A satellite in vacuum:

    Hint

    A satellite in vacuum does not require any energy for orbiting. A satellite orbits Earth when its speed is balanced by the pull of Earth’s gravity. The gravitational force between the earth and the satellite provides the necessary centripetal force to move around the earth.

  32. Question 32 of 50
    32. Question

    Communication satellites are used to:

    Hint

    Communication satellites are used to receive and retransmit communication signals. A satellite is basically a self-contained communications system with the ability to receive signals from Earth and to retransmit those signals back with the use of a transponder—an integrated receiver and transmitter of radio signals.

  33. Question 33 of 50
    33. Question

    ‘Farad’ is the unit of:

    Hint

    Farad is the unit of electrical capacitance (ability to hold an electric charge), in the MKS system of physical units. It is named in honour of the English scientist Michael Faraday.

  34. Question 34 of 50
    34. Question

    Steel is more elastic than rubber because it:

    Hint

    Steel is more elastic than rubber because it required a larger deforming force. If the same amount of force is applied to steel and to rubber, the extension of rubber is easier than the extension of steel. Hence, the strain in steel is much smaller than the rubber.

  35. Question 35 of 50
    35. Question

    On the Moon, an astronaut cannot drink lemonade with the help of straw because:

    Hint

    On the Moon, an astronaut cannot drink lemonade with the help of straw because there is no atmosphere on the Moon. There is no air on the moon and therefore, no air pressure to push the liquid up the straw.

  36. Question 36 of 50
    36. Question

    A particle moving with uniform speed:

    Hint

    A particle moving with uniform speed may or may not have uniform velocity. This is because even if the direction of motion of the body changes, its velocity will get changed. Therefore as long as a body is moving in a constant direction as well as speed its velocity will remain constant.

  37. Question 37 of 50
    37. Question

    Sonar is a device that uses sound waves to detect and range objects on or under the surface of the water.

    Hint

    A device which uses sound waves for detection and ranging is called:

  38. Question 38 of 50
    38. Question

    Earth is a very big magnet. In which direction does its magnetic field extend?

    Hint

    All magnetic objects produce invisible lines of force that extend between the poles of the object. Earth is similar to a giant bar magnet with magnetic field lines radiating from the south to the north magnetic pole.

  39. Question 39 of 50
    39. Question

    Which colour(s) of light has the highest velocity through vacuum?

    Hint

    The velocity of colours depends on the medium through which it is being transferred. The speed of light is maximum in a vacuum. In a vacuum, all the colours have the same speed due to the absence of a medium.

  40. Question 40 of 50
    40. Question

    What type of mirror is used in a view-finding mirror of a vehicle?

    Hint

    A convex mirror is used as a view-finding (side-view) mirror in a vehicle to see the traffic behind. This is because the image formed in a convex mirror is highly diminished due to which a convex mirror gives a wide field of view of the traffic behind the vehicle.

  41. Question 41 of 50
    41. Question

    We receive sunlight on earth surface. What type of light beams are these?

    Hint

    When Rays from a distant point source travel parallel to each other in a particular direction, it forms a parallel Light Beam. The sunRay is an example of a parallel Beam of Light.

  42. Question 42 of 50
    42. Question

    ‘Shock-absorbers’ are usually made of steel as it:

    Hint

    Shock-absorbers are usually made of steel as it has higher elasticity. They are used in vehicles so that the time interval of the jerk increases. Hence, the rate of momentum decreases. Therefore, during the jerk, a lesser force is exerted on the passengers.

  43. Question 43 of 50
    43. Question

    The time period of a pendulum when taken to the Moon would:

    Hint

    The period of oscillation of a simple pendulum is T=2π√(l/g). The value of g is less on the moon than that on the surface of the earth. So T increases. Hence, the time period of a pendulum when taken to the Moon would increase.

  44. Question 44 of 50
    44. Question

    The atmospheric air is held to the Earth by:

    Hint

    The atmospheric air is held to the Earth by gravity. Earth’s gravity is strong enough to hold onto its atmosphere and keep it from drifting into space.

  45. Question 45 of 50
    45. Question

    The function of ball bearings in a wheel is:

    Hint

    The function of ball bearings in a wheel is to convert kinetic friction into rolling friction because rolling friction is much lesser than sliding friction. Ball bearings reduce friction and facilitate easy movement.

  46. Question 46 of 50
    46. Question

    Lambert’s law is related to:

    Hint

    Lambert’s law is related to illumination. The law states that Illuminance at a point on a plane is proportional to the cosine of the angle of light incident (the angle between the direction of the incident light and the normal to the plane).

  47. Question 47 of 50
    47. Question

    A geostationary satellite revolves around the Earth from:

    Hint

    A geostationary satellite is an earth-orbiting satellite, placed at an altitude of approximately 35,800 km directly over the equator, that revolves in the same direction the earth rotates (west to east). At this altitude, one orbit takes 24 hours, the same length of time as the earth requires to rotate once on its axis. So they seem stationary, relative to the Earth’s surface.

  48. Question 48 of 50
    48. Question

    Among the following materials sound travels fastest 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.

  49. Question 49 of 50
    49. Question

    Which phenomenon do bats or dolphins use to find prey, predators or obstacles?

    Hint

    Bats, whales, and dolphins, which hunt in darkness or murky water, find their way by using sound. This is called echolocation.

  50. Question 50 of 50
    50. Question

    What did the first electronic digital computer contain?

    Hint

    ENIAC (Electronic Numerical Integrator and Computer) was the first programmable, electronic, general-purpose digital computer made in 1945 by the United States. ENIAC weighed over 30 tons with over 17,000 valves (vacuum tubes).

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