Question # 1

Why do scientists develop a hypothesis before conducting research.

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Hypotheses help a researcher decide which observations to record and which to ignore

It give them direction on how to interpret the results of their research

It helps to predict outcomes and define the parameters of the rsearch

Hypotheses give the researcherr an outcome to shape their work around

Which one is the quicket method to magnetize a material

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Strike with hammer

Putting inside a current carrying coil

Moving into magnetic field

Stroking the opposite pole

Earth's magnetic field intensity is.

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Constant every warre

Very low at poles

Varies place to place

Very high at equator

A ball is droped from the top of a tower, the distance covered by it in the first second is.

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5 m

10 m

50 m

100 m

Ball dropped freely from a towar reaches ground in 4 s, the speed of impact of ball is.

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2.45 m/s

39. 2 m/s

0 m/s

19. 6 m/s

A body in equilibrium must not have

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Speed

Velocity

Acceleeration

Quantity of motion

The unit of work or energy joule is equal to...............

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Newton metre

Horsepower

Watt metre

Newton second

In which of the materials, particles have only vibrational motion.

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Liquids

Solid

Plasma

Gas

Which one is a non -physical quantituty.

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Density

Colour

Time

Distance

The numerical ratio of displacemnt o distance is

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Equal to or less than one

Always greater than one

Always equal to one

Always less than one

Physics is one of the branches of.

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Life science

Social science

Biological sciences

Physical sciecnes

Two uncharged objects A and B are rubbed against each other. When object B is placed near a negatively charged object C, the two objects repel each other. Which of these statements is true about object A.

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Remains uncharged

Becomes positively charged

Becomes negatively charged

Unpredicatable

In simple Harmonic motion, the acceleration of the body is _____ proportional to the displacement.

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Inversely

Directly

Equally

None of these

Which form of energy is sound:

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Electrical

mechanical

Thermal

Chemical

The waves in which particle of the medium vibrate parallel to the direction of waves are called

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Longitudinal waves

Transverse waves

Electromagnetic waves

both b and c

When frequency of sound wave is increased, which of the following decreases:WavelengthPeriodAmplitude

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(i) Only

(iii) Only

(i) And (ii) only

(i) And (iii) only

The current used in houses is:

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A.C.

Conventiona current

Current

D.C

The pitch of a sound is most closely related to its:

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Wave form

Period

Amplitude

Frequency

From which of the following you can get information almost about everything?

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Book

Teacher

Computer

Internet

isotopes are atom of same element with different.

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Atomic mass

Atomic number

Number of proton

Number of electron

Example of mechanical waves is:

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Radio waves

X-rays

Light waves

Sound waves

The force on a current carrying conductor is maximum if angle between field and conductor is:

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0^o

90^o

180^o

45^o

The efficiency of diesel engine is about

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25 % to 30%

35% to 40%

40% to 50%

50% to 60%

Centripetal force perform

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Maximum work

Minimum work

Negative work

No work

A force of 10N makes an angle 30o with y axis. Then magnitude of x -component is.

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5 N

8.66 N

10 N

Zero

The wavelength of fundamental note in one end closed pipe in term of length 'l' of pipe is.

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4 l

2l

l

1/4 l

The amplitude of a vibrating body at resonance in vacuum is

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Minimum

Maximum

Zero

Infinite

The velocity of a free falling body just before Hattin the ground is 9.8 ms-1, the height through which is fall be

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98 m

19.6 m

4.9 m

9.8 m

A bullet shot straight up, return to its starting point in 10 sec. Its initial speed was

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9.8 ms-1

24.5 ms-1

49 ms-1

98 ms-1

Which one of the following is into directed along the axis of rotation

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Angular acceleration

Angular momentum

Centripetal acceleration

Angular displacement

The location of near point changes with

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Age

Size of the eye

Sharpness of the eye

None of these

The product of rotational inertial 'I' and angular velocity ' w' is equal to.

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Torque

Linear momentum

Angular momentum

Force

Viscosity is represented by Greek letter

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_______ is the building block of every electronic circuit.

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Semi conductor diode

Resistor

Capacitor

Amplifier

There are different crystal systems. The number of these crystal system is.

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3

4

5

7

A galvanometer is an electrical instrument used to

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Measure resistance

Measure voltage

Detect passage of current

None of these

If the ionization energy of hydrogen atom is 13.6 eV, its ionization potential will be

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136.0 volt

3.0 volt

13.6 volt

None of these

The photon with energy greater than 1.02 MeV can interact with matter as.

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Photoelectric effect

Compton effect

Pair production

annihilation of matter

A positron is a particle having.

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Mass equal to electron

Charge equal to electron

Mass equal to mass of electron but charge opposite to charge of electron.

Mass equal to proton

Production of x rays is reverse process of

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Photo electric effect

Compton effect

An nihilation

Pair production

Lenz's law deals with

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Magnitude of emf

Direction emf

Direction of induced current

Resistance

During negative half cycle of A.c then p-n junction offers.

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High resistance

Low resistance

No resistance

All of these

A positron is an anti particle of.

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Proton

Electron

Neutron

Photon

Magnetic effect of current is used in.

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Toaster

Electric iron

Electric motor

D.C. Battery