GK-General Science Question and Answer
GK-General Science Question and Answer
81. When a coil is rotated in magnetic field, induced current is generated in the coil. This principle is used in making ?
- electromagnet
- electric motor
- electric generator
- electric watt meter
82. Distant objects can be seen with the help of
- chronometer
- microscope
- telescope
- spectroscope
83. The safety fuse should have
- high resistance and high melting point
- high resistance and low melting point
- low resistance and high melting point
- low resistance and low melting point
84. Greenhouse is?
- a building chiefly of glass in which the temperature is very low.
- a building in which green plants are cultivated.
- a building chiefly of glass in which the temperature is maintained within the desired range.
- None of these
85. Given below are some of the home appliances:
1. 1/8 H.P. Water pump
2. Fluorescenttubelight
3. Room heater
4. Night lamp
Which of the following is the correct sequence in decreasing order of the wattage of the above?
1. 1/8 H.P. Water pump
2. Fluorescenttubelight
3. Room heater
4. Night lamp
Which of the following is the correct sequence in decreasing order of the wattage of the above?
- 2,1,3,4
- 3,1,2,4
- 3,2,1,4
- 4,2,1,3
86. Which of the following is/are true regarding the third (thicker) pin in a 3-pin plug?
1. It ensures better electrical contact.
2. It is connected to the body of the electrical device.
3. It is connected to the earth terminal.
4. It is connected to the neutral terminal.
1. It ensures better electrical contact.
2. It is connected to the body of the electrical device.
3. It is connected to the earth terminal.
4. It is connected to the neutral terminal.
- 1 and2
- 2 and 3
- 1 and3
- 4only
87. Consider the following statements about a thermos flask:
1. It is a practical device in which the beat flowing into or out of the system by conduction, convection or radiation is reduced as much as possible.
2. It consists of a double – walled glass vessel.
3. The heat transfer by convection is minimized by silvering the surfaces and the radiation is minimized by evacuating the space between the walls.
Of these, the correct ones are
1. It is a practical device in which the beat flowing into or out of the system by conduction, convection or radiation is reduced as much as possible.
2. It consists of a double – walled glass vessel.
3. The heat transfer by convection is minimized by silvering the surfaces and the radiation is minimized by evacuating the space between the walls.
Of these, the correct ones are
- l and 2
- 2 and 3
- l and 3
- l,2 and 3
88. In an ordinary dry cell, the electrolyte is
- sulphuric acid
- manganese dioxide
- ammonium chloride
- zinc
89. Which of the following pairs of materials serves as electrodes in chargeable batteries commonly used in devices such as torch lights, electric shavers etc. ?
- Iron and cadmium
- Nickel and cadmium
- Lead peroxide and lead
- Zinc and carbon
90. The mixed oxide fuel is used for which of the following?
- Nuclear Reactors
- Aero planes
- Cryogenic Engines
- PSLV rockets