Top 100 Important Everyday Science Mcqs Set-3

61- In the ordinary fire extinguisher, carbon dioxide is generated by the reaction of:

A. Marble powder and dilute HCl 
B. Magnetite and dilute HCl 
C. Limestone and dilute H₂SO₄ 
D. Sodium bicarbonate and dilute H₂SO₄

Answer : D. Sodium bicarbonate and dilute H₂SO₄

62- Cryogenic engines find applications in:

A. Rocket technology
B. Frost-free refrigerators 
C. Sub-marine propulsion 
D. Researches in superconductivity

Answer : A. Rocket technology

63- An electron microscope gives higher magnification than an optical microscope because:

A. The electron microscope uses more powerful lenses 
B. The wavelength of electrons is smaller as compared to the wavelength of visible light
C. The velocity of electrons is smaller than that of light
D. The electrons have more energy than light 

Answer : B. The wavelength of electrons is smaller as compared to the wavelength of visible light

64- Which of the following take place when the subject speaks untruth while being tested on the polygraph instrument?
1. His blood pressure goes up
2. His pulse quickens
3. His skin darkens
4. He sneezes

A. 1 and 2
B. 3 and 4
C. 1, 2 and 3 
D. 2, 1, 3

Answer : A. 1 and 2

65- Which vitamin is produced by the human body when exposed to sunlight?

A. Vitamin A
B. Vitamin B12
C. Vitamin C
D. Vitamin D

Answer : D. Vitamin D

66- The process by which plants make their food is called:

A. Respiration
B. Photosynthesis
C. Transpiration
D. Fermentation

Answer : B. Photosynthesis

67- By the use of which of the following can the conversion of heat energy to electrical energy be achieved?

A. Thermo-couple
B. Triode valve 
C. Photoelectric cell 
D. None of these

Answer : A. Thermo-couple

68- 'Teletext' means:

A. The process of converting black & white TV sets into coloured ones
B. Flashing of telephone conversation on TV screen 
C. Flashing the text of the message on the telex machine 
D. Connecting the local telephones with outstation telephones without code numbers
E. Flashing of the text of news and information on the TV screen

Answer : E. Flashing of the text of news and information on the TV screen

69- Which of the following statements about a refrigerator is/are correct?
1. It converts electrical energy into heat energy.
2. It converts electrical energy into mechanical energy.
3. It transfers heat from a high temperature to a low temperature.
4. It transfers heat from a low temperature to a high temperature.

A. 1 and 3 
B. 2 and 3 
C. 1 and 4
D. 4 only

Answer : C. 1 and 4

70- Which of the following statements are true regarding transmission of television programmes?
1. Picture is transmitted with velocity of light.
2. Sound is transmitted with velocity of sound.
3. Sound is transmitted with velocity of light.
4. Different colours of the picture are transmitted with different velocities.

A. 1 and 3 
B. 1, 2 and 3
C. 2, 3 and 4
D. 1, 3 and 4

Answer : A. 1 and 3

71- If S denotes sound energy, E denotes electrical energy and M denotes magnetic energy, the correct representation of recording and reproduction in an audio tape recorder is:

A. S-E-M-E-S
B. S-M-E-M-S
C. E-S-M-S-E
D. E-M-E-S

Answer : A. S-E-M-E-S

72- Ball bearings are used to reduce friction by:

A. Applying lubricants to the balls used 
B. Reducing the area of contact with the use of metallic balls
C. Increasing the area of contact with the use of metallic balls 
D. None of these

Answer : B. Reducing the area of contact with the use of metallic balls

73- Recoil of a gun is an example of:

A. Conservation of mass 
B. Conservation of energy 
C. Conservation of P.E. into K.E 
D. Conservation of linear momentum

Answer : D. Conservation of linear momentum

74- Mercury is used in barometer because it:

A. 1, 2, 3 and 4
B. 2, 3 and 4
C. 1, 2 and 3 
D. 1 and 3 

Answer : A. 1, 2, 3 and 4

75- Which of the following computer languages is maximum used for business and scientific purposes?

A. BASIC
B. FORTRAN
C. COBOL
D. None of these

Answer : B. FORTRAN

76- The anode in a dry cell consists of:

A. Zinc
B. Graphite
C. Copper
D. Cadmium

Answer : A. Zinc

77- A triode differs from a diode in that:

A. Its current is caused by photoelectric effect 
B. It has vacuum inside 
C. It can amplify a signal
D. None of these

Answer : C. It can amplify a signal

78- Which of the following is the fastest storing input/output device in a computer?

A. Magnetic Floppy disc 
B. Teletype writer 
C. Visual Display unit 
D. SSD

Answer : D. SSD

79- To achieve high value of rocket velocity, one must have:

A. High exhaust velocity and low loss of mass during propulsion
B. High exhaust velocity and higher loss of mass during propulsion
C. Both A and B
D. None of these

Answer : A. High exhaust velocity and low loss of mass during propulsion

80- Radioactive substances can be produced readily in a/an:

A. Wilson cloud chamber 
B. Atomic pile
C. Electron gun 
D. Transistor

Answer : B. Atomic pile

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