4
Q:

# When one enters a dark room after being in bright light one is not able to see anything clearly for a while because

 A) the retina of the eye moves forward B) the retina of the eye moves backward C) the iris is unable to dilate the pupil immediately to be able to see things D) the eye has no power of accommodation

Answer:   C) the iris is unable to dilate the pupil immediately to be able to see things

Explanation:

The size of the pupil of the eye automatically adjusts itself  according to the intensity of light passing through it;if the intensity is more , the size is less, if less, it is more. So in our case the pupil should dilate i.e, increase in size to be able to see in the dark . This switchover takes sometime. But here the entry into the dark room is immediate . So the eye has no time to adjust itself and hence is not able to see at all for a while.

Subject: Physics
Q:

Which phase change is an example of an exothermic process?

 A) Liquid to Solid B) Gas to Solid C) Gas to Liquid D) All the above

Explanation:

Processes that require or give off heat will be limited to changes of state, known as phase changes, and changes in chemical constitution, or chemical reactions. Changes of state involve a solid melting, a liquid freezing, a liquid boiling or a gas condensing.

An exothermic process is one that gives off heat, which is transferred to the surroundings. An endothermic process is a reaction which heat has to be supplied to the system from the surroundings.

Here in all the given options, heat is taken away from them to change there phase.

Liquid to Solid --- Freezing

Gas to Liquid --- Condensation

Gas to Solid --- Deposition

are all examples of exothermic processes.

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1 13
Q:

Air pressure is measured in which of the following units?

 A) Steridian B) kg/mts C) Newton D) Pascal

Explanation:

Pressure = (Net Force) / (Applied area) = Newton / square meters

Measuring units of pressure are:

. Pascal
. Bar
. Torr
. Pounds per square inch (psi)
. Standard atmosphere (atm).

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0 7
Q:

Where should a boat compass be mounted?

 A) near magnet B) near iron C) away from electrical wiring D) All the above

Explanation:

A compass, which is used to assist in navigation, is an instrument that shows magnetic north. You must apply a correction to determine the direction of true north. The ability to steer a boat by a compass is useful if land is out of sight, visibility is reduced, or the boat operator is disoriented.

Mount a boat compass away from iron, magnets, and electrical wiring and equipment.

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0 30
Q:

What part of the atom has a positive charge?

 A) Neutron B) Proton C) Electron D) All the above

Explanation:

Protons carry a positive electrical charge, electrons carry a negative electrical charge and neutrons carry no electrical charge at all. The protons and neutrons cluster together in the central part of the atom, called the nucleus, and the electrons 'orbit' the nucleus.

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0 16
Q:

Unresolved dissonance is a characteristic of

When the tension is unresolved, we have unresolved dissonance. Unresolved dissonance is a characteristic of the baroque music.

The general characteristics of Baroque music is movement, energy, and tension.

99
Q:

What is the relationship between Resistivity and Conductivity?

Resistivity :

Resistivity is a measure of the resistance to the flow of electrons.

Conductivity :

Conductivity is just the inverse of resistivity, σ = 1/ρ, where σ is conductivity and ρ is resistivity.

Example:

Think of a pipe and water, the bigger the pipe, the easier water can flow and thus the lower the resistance.

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39
Q:

What frequency range is the high frequency band?

 A) 3 kHz B) 3 to 30 MHz C) 30 to 300 MHz D) 10 GHz

Explanation:

The HF band is based on frequencies 3 to 30 Mhz. AM radio stations are in the HF band but normally are stated in kilohertz.

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0 61
Q:

Which of the following has the highest frequency?

 A) Cosmic rays B) X-rays C) Radio waves D) Microwaves