What are the basics of physics?

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asked Mar 11, 2018 by anonymous

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asked Mar 11, 2018 by anonymous

What are the basic laws of physics?

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asked Apr 9, 2018 by anonymous

A radioactive isotope has a half-life of 10 days. If today there are 125 g of it left, what was its original weight...

A radioactive isotope has a half-life of 10 days. If today there are 125 g of it left, what was its original weight 40 days earlier (a) 600 g (b) 1000 g (c) 1250 g (d) 2000 g

Last answer: Half life = 10days The formula which is, 1/(2)^n × original weight = Weight left today. To obtain the value of n = divide no of days by half life ie.,n= 40/10= 4 n=4 So, 1/(2)^n × original Weight = 125g 1/(2)^4 × Original weight = 125 Original weight = 16×125 = 2000g

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asked 3 days ago by anonymous

What is a compound microscope? (1) A microscope that has one lens. (2) A microscope that has two sets of lenses : an occular lens and an eyepiece. (3) A microscope whose lenses are concave. (4) A microscope whose lenses are convex.

Last answer: A microscope that has two sets of lenses : an occular lens and an eyepiece.

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asked Jul 23, 2019 by anonymous

Testing and commissioning basics

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asked May 25, 2018 by anonymous

Both donor and acceptor impurities are present in the combination of

Both donor and acceptor impurities are present in the combination of (a) Phosphorous - Arsenic (b) Aluminium - Antimony (c) Boron - Gallium (d) Arsenic - Antimony

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asked Apr 9, 2018 by anonymous

Angles project true size only when the plane containing the angle and plane of projection are...

Angles project true size only when the plane containing the angle and plane of projection are (a) Aligned (b) Adjacent (c) Perpendicular (d) Parallel

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asked Apr 9, 2018 by anonymous

X-rays are used for the study of crystal structure because...

X-rays are used for the study of crystal structure because (a) X-rays are completely absorbed by the crystal (b) the wavelength of X-ray is of the same order of magnitude in the inter-atomic spacing in crystals (c) the wavelength of X-rays is very small in comparison with the inter-atomic spacing in crystals (d) the crystals are completely transparent to X-rays

Last answer: the wavelength of X-ray is of the same order of magnitude in the inter atomic spacing in crystals

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asked May 26, 2018 by anonymous

Ferrites are types of

Ferrites are types of (a) magnetic material (b) conducting material (c) semiconducting material (d) insulating material

Last answer: Ferrites are types of magnetic material.

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asked May 26, 2018 by anonymous

In which material, valence electrons are tightly bounded to their parent atoms ?

In which material, valence electrons are tightly bounded to their parent atoms ? (a) Conductor (b) Semiconductor (c) Insulator (d) Magnetic

Last answer: Insulator material

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asked May 25, 2018 by anonymous

Three materials X, Y and Z having relative permittivity 2.5, 3.0 and 4.0 respectively are used in a single core

Three materials X, Y and Z having relative permittivity 2.5, 3.0 and 4.0 respectively are used in a single core cable. The materials on inner most and outer most layer respectively should be (a) X and Y (b) Y and Z (c) X and Z (d) Z and X

Last answer: Answer is option d Because the material with high relative permitivity should be used as the inner most layer of the cable,to withstand with the high currents flowing in the conductor

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asked Feb 28, 2018 by anonymous

Which semiconductors are preferred to make LEDs and why?

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asked Dec 18, 2017 by anonymous

What is the charge and mass of an electron?

Last answer: Charge on electrons is 1.6022*10-19CAnd the mass of electrons is 9.109*10-31 kg

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asked 2 days ago by anonymous

On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because : (1) metals have higher thermal capacity than plastics (2) plastics have a lower density than metals (3) metals are good conductors of heat (4) plastics have a higher thermal conductivity than metals

Last answer: metals are good conductors of heat

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asked 2 days ago by anonymous

Which of the following are methods of heat transfer? (1) Convection (2) Evaporation (3) Revolution (4) Thermal Expansion

Last answer: Convection

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asked 2 days ago by anonymous

For which one of the following, ‘Diodes’ are generally used for? (1) Rectification (2) Amplification (3) Modulation (4) Filtration

Last answer: Rectification

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asked 2 days ago by anonymous

To prevent damage from lightning, lightning conductors are used on tall structures. The lightning conductor (1) should be made of a good conductor but can be of any shape (2) should be in the form of a vertical rod (3) can be of any shape (4) should be made of a good conductor like copper with sharp-pointed edges

Last answer: should be made of a good conductor like copper with sharp-pointed edges

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asked 2 days ago by anonymous

Rainbows are produced when sunlight : (1) Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction (2) Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction and internal reflection. (3) Incident on raindrops hanging in the atmosphere is dispresed after suffering reflection. (4) None of the given statements is correct.

Last answer: Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction and internal reflection.

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asked 2 days ago by anonymous

Which one of the following is not a feature of Indifference Curve? (1) They do not intersect each other (2) They slope downwards to the right (3) They are parallel to each other (4) They are concave to each other

Last answer: They are concave to each other

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asked 2 days ago by anonymous

Burns caused by steam are much severe than those caused by boiling water because (1) Steam pierces through the pores of body quickly (2) Steam has latent heat (3) Steam is gas and engulfs the body quickly (4) Temperature of steam is higher

Last answer: Steam has latent heat

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asked 3 days ago by anonymous

A man standing at the top of a tower has two spheres A and B. He drops sphere A downwards and throws sphere B horizontally at the same time. Which of the following is correct ? (1) Both the spheres will reach the ground simultaneously. (2) A will reach the ground first. (3) B will reach the ground first. (4) The question is incomplete because the masses of the spheres are not given.

Last answer: Both the spheres will reach the ground simultaneously.

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asked 3 days ago by anonymous

In a particular system, the units of length, mass and time are chosen to be 10 cm, 10 g and 0.1 s respectively. The unit of force in this system will be equivalent to (1) 0.1 N (2) 1 N (3) 10 N (4) 100 N

Last answer: 0.1 N

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asked 3 days ago by anonymous

A wire of resistance R is cut into ‘n’ equal parts. These parts are then connected in parallel. The equivalent resistance of the combination will be

Last answer: R/n2

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asked 3 days ago by anonymous

Super conductors are substances that (1) offer minimum resistance to flow of electric current (2) conduct electricity at low temperature (3) conduct electricity at high temperature (4) offer high resistance to the flow of electric current

Last answer: offer minimum resistance to flow of electric current

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asked 3 days ago by anonymous

The Laser is a beam of radiations which are (1) Non-coherent and monochromatic (2) Coherent and monochromatic (3) Non-coherent and non-monochromatic (4) Coherent and non-monochromatic

Last answer: Coherent and monochromatic

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asked 3 days ago by anonymous

When a stone is thrown in the calm water of a pond the waves produced on the surface of water in the pond are (1) longitudinal (2) transverse (3) both longitudinal and transverse (4) waves are not produced

Last answer: transverse

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asked 3 days ago by anonymous

Gas thermometers are more sensitive than the liquid thermometers because the gases (1) have large coefficient of expansion (2) are lighter (3) have low specific heat (4) have high,specific heat

Last answer: have large coefficient of expansion

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asked 3 days ago by anonymous

In the remote control of television, electromagnetic waves used are (1) ultraviolet (2) microwave (3) radiowave (4) infrared

Last answer: infrared

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asked 3 days ago by anonymous

When two ice cubes are pressed together, they join to form one cube. Which one of the following helps to hold them together? (1) Hydrogen bond formation (2) Vander waals forces (3) Covalent attraction (4) Dipole interaction

Last answer: Hydrogen bond formation

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asked 3 days ago by anonymous

Convex mirrors are used as a rear view mirror in motor cycles because (1) it forms real image (2) it forms erect (upright) image (3) it forms smaller image as compared with object (4) All of the above

Last answer: it forms smaller image as compared with object

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asked 3 days ago by anonymous

A drop of liquid assumes spherical shape because: (1) Intermolecular forces are strong in liquids (2) A sphere has the least surface area for a given volume (3) A sphere has the largest surface area for a given volume (4) Inter molecular forces are weak in liquids

Last answer: A sphere has the least surface area for a given volume

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asked 3 days ago by anonymous

The temperature of boiling water in a steam engine may be high because : (1) there are dissolved substances in water (2) there is low pressure inside the boiler (3) there is high pressure inside the boiler (4) the fire is at very high temperature

Last answer: there is high pressure inside the boiler

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asked 3 days ago by anonymous

Railway tracks are banked on curves so that (1) Necessary centrifugal force may be obtained from the horizontal component of the weight of the train (2) No frictional force may be produced between the tracks and the wheels of the train (3) Necessary centripetal force may be obtained from the horizontal component of the weight of the train (4) The train may not fall down inwards

Last answer: Necessary centripetal force may be obtained from the horizontal component of the weight of the train

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asked 3 days ago by anonymous

Why do brids not have respiratory trouble at the time of flying at high altitude ? (1) Their lungs are very large (2) They fly inactively (3) They have extra air sacs (4) They use less oxygen

Last answer: They have extra air sacs

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asked 3 days ago by anonymous

If an ordinary glass tube and a glass capillary tube are both dipped in a beaker of water, water rises in (1) both (2) only the glass tube (3) only the capillary tube (4) neither

Last answer: both

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asked 4 days ago by anonymous

It is easier to carry two buckets of water in one hand each, than to carry only one in one hand because (1) weights of buckets are balanced (2) centre of gravity falls within the body (3) centre of gravity and centre of equilibrium fall within the feet (4) resultant weight of buckets is zero

Last answer: centre of gravity and centre of equilibrium fall within the feet

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asked 4 days ago by anonymous

A bird sitting on a high tension electric wire does not get electrocuted because (1) it has high resistance (2) the body is earthed (3) it does not form a closed path for the flow of current (4) its feet are good insulators

Last answer: it does not form a closed path for the flow of current

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asked 4 days ago by anonymous

Damp clothes are dried in spin dryers by the action of (1) centripetal forces (2) centrifugal forces (3) central forces (4) non central forces

Last answer: centrifugal forces

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asked 4 days ago by anonymous

The audio signals of TV are (1) Amplitude modulated (2) Frequency modulated (3) Unmodulated (4) Velocity modulated

Last answer: Frequency modulated

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asked 4 days ago by anonymous

Ice cubes are added to a glass of pure water and a glass of pure alcohol. The ice would be (1) at a higher level in water (2) at a higher level in alcohol (3) at the same level in both (4) floating in alcohol and sinking in water

Last answer: at a higher level in water

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asked 4 days ago by anonymous

In a railway track, two rails are joined end to end with a gap in between thembecause (1) steel can be saved (2) accidents due to contraction in winter can be avoided (3) air-gaps are necessary for bearing the weight of running train (4) accidents due to expansion in summer can be avoided.

Last answer: accidents due to expansion in summer can be avoided.

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asked 4 days ago by anonymous

Light houses are places with powerful lights to : (1) guide and resolve traffic jams in crowded metro-cities during nights. (2) guide and help large crowds at religious gathering during nights. (3) indicate to the incoming warships, the location of a harbour during night. (4) guide and warn the ships coming from different directions in the ocean.

Last answer: guide and warn the ships coming from different directions in the ocean.

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asked 4 days ago by anonymous

The sounds having a frequency of 20 Hertz to 20,000 Hertz are known as (1) Audible sounds (2) Ultrasonics (3) Infrasonics (4) Megasonics

Last answer: Audible sounds

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asked 4 days ago by anonymous

Optical fibres are based on the phenomenon of (1) Interference (2) Dispersion (3) Diffraction (4) Total Internal Reflection

Last answer: Total Internal Reflection

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asked 4 days ago by anonymous

A piece of paper and a cricket ball are dropped from the same height. Under which of the following conditions do both reach the surface simultaneously ? (1) They must have the same volume (2) They must have the same density (3) They must have the same mass (4) They must be dropped in vacuum

Last answer: They must be dropped in vacuum

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asked 4 days ago by anonymous

Two stones of unequal masses are thrown vertically up with the same velocity. Which of the following will happen? (1) The heavier mass will reach greater height (2) The lighter mass will reach greater height (3) Both will reach the same height (4) Any of them may reach greater height

Last answer: Both will reach the same height

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asked 4 days ago by anonymous

Angle of friction and angle of repose are (1) equal to each other (2) not equal to each other (3) proportional to each other (4) None of the above

Last answer: equal to each other

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asked 4 days ago by anonymous

The bats can fly in the dark because (1) they can see the objects in darkness (2) they have weak legs and are likely to be attacked by predators (3) they generate flashes of light (4) they generate ultrasonic sound waves

Last answer: they generate ultrasonic sound waves

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asked 4 days ago by anonymous

Two stones of different masses are dropped simultaneously from the top of a building (1) Smaller stone reaches the ground earlier (2) Larger stone reaches the ground earlier (3) Both the stones reach the ground at the same time (4) Depends on the composition of the stone

Last answer: Both the stones reach the ground at the same time

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asked 4 days ago by anonymous

Ventilators are provided near the ceiling of the room because (1) the exhaled warmer air rises up and goes out (2) these provide cross ventilation in the room (3) these provide some sunlight in the room (4) these do not look nice in the lower part

Last answer: the exhaled warmer air rises up and goes out

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asked 4 days ago by anonymous

A parachute descends slowly whereas a stone dropped from the same height falls rapidly, because (1) stone is heavier than parachute (2) special mechanisms are present in parachute (3) a parachute has a larger surface area and air resistance is more (4) None of these

Last answer: a parachute has a larger surface area and air resistance is more

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What are the basics of physics?

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