- (A) Emitter
- (B) Base
- (C) Collector
- (D) All of the above
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Four resistances R1=20Ω, R2=50Ω and R R3=1Ω are connected in parallel. The equivalent resistance is R:
- (A) R>1Ω
- (B) R>3Ω
- (C) R<1Ω
- (D) R<4Ω
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The magnitude of the force of the gravity between two identical objects is given by F0. If the mass of each object is doubled and the distance between them is doubled. Then the new force of gravity between the objects will be?
- (A) F0/16
- (B) F0
- (C) 2F0
- (D) 4F0
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The force of gravity above the earth surface is proportional to and inside the earth it is proportional to?
- (A) 1/r, r
- (B) 1/r, r2
- (C) 1/r2, r
- (D) 1/r2, r2
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The work function for silver surface is 4.73 eV. Find the minimum frequency that light must have to eject electrons from this surface (h=6.63×10-34 J.s)?
- (A) 1.14×1023Hz
- (B) 1.14×1015Hz
- (C) 3.14×1023Hz
- (D) None of the above
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A Kilowatt hour is a unit of?
- (A) Energy
- (B) Power
- (C) Voltage
- (D) Time
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Energy gap in a semiconductor is?
- (A) More than that of an insulator.
- (B) Less than that of an insulator.
- (C) Equal to that of an insulator.
- (D) None of the above
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The mass of oxygen is 32 u(atomic mass unit). How many molecules of oxygen are in 32 g of oxygen?
- (A) 1×(6.022×1023) molecules
- (B) 1×(6.022×1018) molecules
- (C) 1/2×(6.022×1023) molecules
- (D) 1/2×(6.022×1022) molecules
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If the driver in the bus you are travelling in suddenly accelerates?
- (A) You remain where you were.
- (B) Insufficient information.
- (C) You are pushed backwards.
- (D) You are thrown forward.