Top 100 Important Everyday Science Mcqs Set-3

41- The most efficient engine is:

A. Petrol
B. Diesel
C. Electric
D. Steam

Answer : B. Diesel

42- The tape of a tape recorder is coated with:

A. Zinc oxide 
B. Copper sulphate
C. Mica
D. Ferromagnetic powder

Answer : D. Ferromagnetic powder

43- When a coil is rotated in a magnetic field, induced current is generated in the coil. This principle is used in making:

A. Electromagnet
B. Electric motor 
C. Electric generator
D. Electric watt meter

Answer : C. Electric generator

44- Distant objects can be seen with the help of:

A. Telescope
B. Chronometer
C. Microscope
D. Spectroscope

Answer : A. Telescope

45- The safety fuse should have:

A. Low resistance and low melting point
B. Low resistance and high melting point 
C. High resistance and high melting point 
D. High resistance and low melting point

Answer : D .High resistance and low melting point

46- Greenhouse is:

A. A building in which green plants are cultivated 
B. A building chiefly of glass in which the temperature is very low 
C. A building chiefly of glass in which the temperature is maintained within the desired range
D. None of these

Answer : C. A building chiefly of glass in which the temperature is maintained within the desired range

47- The hydraulic brakes used in automobiles is a direct application of:

A. Archimedes’ Principle 
B. Torricellian law 
C. Bernoulli’s theorem 
D. Pascal’s law

Answer : D. Pascal's law

48- Sensitive layer of the eye is:

A. Choroid
B. Sclerotic
C. Retina
D. None of these

Answer : C. Retina

49- The hardest natural substance on Earth is:

A. Iron
B. Diamond
C. Gold
D. Platinum

Answer : B. Diamond

50- Which of the following are true regarding the compact fluorescent tubes now available in market for home use?

A. They use less power compared to filament type bulbs for same amount of light.
B. They operate at higher voltages.
C. They are narrower and shorter than common fluorescent tubes.
D. All of these

Answer : D. All of these

51- In an ordinary dry cell, the electrolyte is:

A. Sulphuric acid
B. Manganese dioxide 
C. Ammonium chloride
D. Zinc

Answer : C. Ammonium chloride

52- A telephone receiver consists of permanent magnet with wires around it and a metal diaphragm in front of the magnet.
1. The current in the wire neutralizes completely the field of the permanent magnet.
2. The current in the wire adds a small component to the field of the magnet.
3. The diaphragm rotates due to the signal.
4. The diaphragm vibrates due to the signal.

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

Answer : D. 2 and 4

53- An electric motor runs on which principle?

A. Electrical energy can be converted into chemical energy in the presence of magnetic fields 
B. A conductor carrying current in the direction perpendicular to the external magnetic field feels a force
C. The current flowing through a conductor causes generation of heat that drives the engine 
D. Changing magnetic field induces an electromotive force in a conductor

Answer : B. A conductor carrying current in the direction perpendicular to the external magnetic field feels a force

54- Which of the following pairs of materials serves as electrodes in chargeable batteries commonly used in devices such as torch lights, electric shavers etc.?

A. Iron and cadmium 
B. Nickel and cadmium
C. Lead peroxide and lead 
D. Zinc and carbon

Answer : B. Nickel and cadmium

55- Which of the following works on Bernoulli's principle?

A. Gas lighter
B. Gas stove
C. Bunsen burner
D. None of these

Answer : C. Bunsen burner

56- The mixed oxide fuel is used for which of the following?

A. Nuclear Reactors
B. Aeroplanes
C. Cryogenic engines 
D. PSLV rockets

Answer : A. Nuclear Reactors

57- Conversion of chemical energy into electrical energy occurs in:

A. Dynamos
B. Electric heaters
C. Batteries
D. Atomic bombs

Answer : C. Batteries

58- Dialyzer is a/an:

A. Apparatus sometimes used in patients with defective renal function
B. Special clock which indicates the day and date 
C. Meter used for controlling volume of sound 
D. Apparatus used for recharging batteries 

Answer : A. Apparatus sometimes used in patients with defective renal function

59- For which of the following is a diode used?

A. Rectification
B. Amplification
C. Modulation
D. Oscillation

Answer : A. Rectification

60- What is the nature of motion of a machine needle?

A. Vibratory and rotatory
B. Rotatory and translatory 
C. Oscillatory and translatory
D. Rotatory and oscillatory 

Answer : C. Oscillatory and translatory

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