Question # 1

When forwarded bias is applied to a junction diode it.

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Increases the potential barrier

Decreases the potential barrier

Reduces the majority carrier current to zero

Reduces the minority carrier current to zero

The result of the alpha particle scattering experiment gave evidence for which of the following.

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Nuclear fusion

Radio active decay

Existence of isotopes

Nuclear atom

Which is the famous standard model of the universe.

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the big bang

Casmos

Astronaut

The small stap

The moment of linear momentum is called.

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Torque

Couple

Impulse

Angular momentum

If a wave vibrates 10 times in one second with a speed of 10 m s-1 the wavelength will be.

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1 m

10 m

20 m

100 m

By placing soft iron inside a coil

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Increases the magnetic flux

Decreases the magnetic flux

Creates no change in magnetic flux

Decreases the diameter of the core

During a thunderstorm, an observer sees a lighting flash Six second later he hears the thunder The speed of sound is 330 m s-1. Approximately how far away is the observer from the lighting.

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1/2 km

1/3 km

2 km

1/20 km

Which law states that the angle of incidence equals the angle of refraction.

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Law of reflection

Law of refraction

Snell's law

Hygens's principle

In open circuit electromotive force equal to

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Current

Resistance

Voltage

Inductence

Certain gas are called permanent gases because.

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They cannot be liquified

They are perfect gases

The critical temperatures are low

their boiling points are low

The minimum angle of incidence for which total internal reflection can occur is called.

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Right angle

Acute angle

Critical angle

Obtuse angle

If the earth stopped rotating the weight of objects at either pole would.

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Be grater

Be less

Vary with altitude

Be the same before

Which scientist announced for the first time that the universe is expanding.

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Einstein

Newton

Edward Hubble

Karl Marx

The maximum displacement from the undisturbed position of the medium to the crest top is called.

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Wavelength

Amplitude

Period

Frequency

The gravitational strength on the surface of moon is 1.6 N kg-1 What will be the mass and weight of an object respectively on the surface of the moon.

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10 kg , 1.6 N

10 Kg , 16 N

16 Kg, 10 N

16 kg, 160 N

If a gas does 10 J of external work white expanding then the change in internal energy is equal to.

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0 J

10 J

-10 J

100 J

A type of resistor whose resistance varies significantly with temperature is.

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Thermistor

Thermocouple

Strain gauge

Potentiometer

The gama rays have

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Thin tracks

Thick tracks

No definite tracks

Continuous tracks

What is the heat required in Kilo joules when the temperature of 100 g of copper is raised thgough 20 K/. Specific heat capacity of copper is 0.4 x 10-3 kg -1 k-1

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0.4 kj

0.8 kj

400 kj

800 kj

If the cross sectional area of the pipe decreases the speed of the fluid increase according to.

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Venturi relation

Bernoulli's equation

Equation of continuity

Torriculli's theroem

Which scientist made the fist successful terrestrial measurement of the speed of light

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Isaac Newton

Ole Romer

Armand Fizeace

Albert Michelson

A real object paled inside the focus of a convex lens gives

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Real image but diminshed

Real image but enlarged

virtual image but diminished

Virtual image but enlarged

The pressure of a gas is directly proportions to

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Mean velocity of the molecules

Mean square velocity of the molecules

Root mean square velocity of the molecules

Instantaneous velocity of the molecules

Temperature of a system remains constant in

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Adiabatic process

Isobaric process

Isothermal process

Isochoric process

The magnitude of the instantaneous velocity is called the.

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_Displacement

Speed

Acceleration

Length

What is the triple point of water.

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273 .15 K

0 K

100 K

0 oC

Capacitance is define das

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VC

Q/V

QV

V/Q

A fluid is said to be ideal if it is

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Non viscous

Non viscous and incompressible

Non viscous and with steady flow

Non viscous incompressible and has steady flow

A torch bulb uses a 3 V supply and makes a current of 0.2 A It is switched on for one minute How much electrical energy is used.

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0.6 J

12 J

24 J

36 J

The Beta particles move along.

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Straight path

Curved path

Zig Zag path

Circular path

When amplitude of a wave becomes double its energy becomes.

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Xero

Double

4 times

6 times

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