Related Questions

A delivery car went from Candleford to Lark Rise and back at an average speed of23 miles per hour. If the distance from Candleford to Lark Rise is 1 mile, and the trip back too half as much time as the trip there, what was the average speed of the delivery car on the way to Lark Rise?
A 13
B 34
C 12
D 23
A delivery cart went from Candle ford to Lark Rise and back at an average speed of 2/3 miles per hour. If the distance from Candle ford to Lark Rise is 1 mile, and the trip back took half as much time as the trip there, what was the average speed of the delivery cart on the way to Lark Rise?
A 1/3
B 3/4
C 1/2
D 2/3
For most salts, the solubility increases with rise in temperature, but the solubility of __________ is nearly independent of temperature rise.
A Sodium chloride
B Sodium carbonate monohydrate
C Anhydrous sodium sulphate
D Hypo
With increase in temperature, the electrical conductivity of semiconductors
A Increases
B Decreases
C Remain constant
D Either A or B, depends on the type of semi-conductor
The ratio of the temperature rise of cooling water to the vacuum temperature minus inlet cooling water temperature is called
A Condenser efficiency
B Vacuum efficiency
C Nozzle efficiency
D Boiler efficiency
With rise in temperature the resistance of pure metals
A Increases
B Decreases
C First increases and then decreases
D Remains constant
When two semiconductors of p and n-type are brought in contact, they form p-n junction which acts like a/an
A Conductor
B Oscillator
C Rectifier
D Amplifier
The conduction of electricity, in semiconductors, takes place due to movement of
A Positive ions only
B Negative ions only
C Positive and negative ions
D Electrons and holes
Is an element used in semiconductors whose atoms have three valence electrons.
A An acceptor
B A donor
C Germanium
D Silicon
The impurity atoms is semiconductors
A Inject more charge carriers
B Reduce the energy gap
C Increase the kinetic energy of valence electrons
D All of the above

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