Which tube used to produce X-ray?
A. Coolidge tube
B. X-ray tube
C. Roentgen
D. None of these
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A Fuse wire is characterised by
A. High resistance and low melting point
B. High resistance and high melting point
C. Low resistance and high melting point
D. Low resistance and low melting point
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When the main switch of the house is put off it disconnects the
A. Live wire only
B. Live wire and the earth wire
C. Live wire and the neutral wire
D. Earth wire and the neutral wire
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Electric power is measured in units of
A. Volt
B. Joule
C. Watt
D. Ampere
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Find the current (in A) when a charge of 500 Coulomb flows in 25 seconds.
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What is the value of 1 kW = ?
A. 1000 W
B. 10 W
C. 100 W
D. 10000 W
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The electric current in a metal wire is due to the flow of -
A. Electrons
B. Protons
C. Ions
D. Holes
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An electric fuse is based on
A. The chemical effect of the current
B. The magnetic effect of the current
C. The heating effect of the current
D. All of the above
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Metals are good conductors of electricity because
A. The atoms are lightly packed
B. They contain free electrons
C. They have high melting point
D. All the above
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Find the current (in A) when a charge of 1200C flows in 6 seconds.
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The fuse in an electric circuit is connected in
A. Series with neutral
B. Parallel to live
C. Parallel to neutral
D. Series with live
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Working of safety fuses depends upon 1. magnetic effect of the current 2. chemical effect of the current 3. magnitude of the current 4. heating effect of the current Select the correct answer using the code given below.
A. 1, 2, 3 and 4
B. 1, 2 and 3 only
C. 3 and 4 only
D. 4 only
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During thunderstorm you are travelling in a car. To protect yourself from the lightning you will have to
A. Remain in the car
B. Get out of the car and lie flat in the ground
C. Abandon the car and take shelter under a nearby tree
D. Touch the nearest electric pole
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The unit of electrical power is
A. Bolt
B. Watt
C. Kilowatt hour
D. Ampere
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Safety fuse wire used in domestic electrical appliances is made of metal of low
A. Resistance
B. Melting point
C. Specific gravity
D. Conductance
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The best conductor of electricity among the following is :
A. Copper
B. Iron
C. Aluminium
D. Silver
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Kilowatt-hour is the unit of :
A. Energy
B. Power
C. Force
D. Momentum
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Copper wires are generally used for electrical power transmission instead of iron wire because :
A. Copper is cheaper than iron
B. Copper is lighter than iron
C. Copper is a better conductor of electricity than iron
D. Copper can take higher power than iron
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The earth-wire of a cable is connected to
A. The outer metallic body of the appliance
B. The fuse of the appliance
C. The filament of the appliance
D. Short circuitry of the appliance
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Lightning is caused due to
A. Electric power
B. Electric discharge
C. Electric leak
D. Electric pressure
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