Practice Test

Q1) For television broadcasting the frequency employed is normally Show Answer

Q2) In which frequency range, space waves are normally propagated?
Show Answer

Q3) The process of superimposing single frequency (i.e. audio wave ) on the carrier wave is known as Show Answer

Q4) Range of frequency allotted for commercial FM radio broadcast is Show Answer

Q5) Through which mode of propagation , the radio waves can be sent from one to another ? Show Answer

Q6) The electromagnetic wave of frequency 80 MHz to 200 MHz Show Answer

Q7) UHF is used in Show Answer

Q8) Modulation is the phenomenon of Show Answer

Q9) When an electromagnetic wave enters an ionised layer of earth's atmosphere present in ionosphere. Show Answer

Q10) Audio signal cannot be transmitted because Show Answer

Q11) In frequency modulation Show Answer

Q12) A transistor is essentially Show Answer

Q13) Zener diode is used for Show Answer

Q14) The energy band gap is maximum in Show Answer

Q15) In an insulator, the forbidden energy gap between the valence band and conduction band is of the order of Show Answer

Q16) Which of the following is NOT an amorphous substance ? Show Answer

Q17) The number of atoms per unit cell in a sc, bcc and fcc system are Show Answer

Q18) In the photoelectric effect, electrons are emitted Show Answer

Q19) The best metal to be used for photo emission is Show Answer

Q20) A moderator is used in nuclear reactors in order to Show Answer

Q21) The nuclear radius is of the order of Show Answer

Q22) Air becomes conducting when the pressure ranges between Show Answer

Q23) Diamond is very hard because Show Answer

Q24) In light modulation , which characteristic of the Carrier light wave is varied ? Show Answer

Q25) What is the band width in amplitude modulation? Show Answer

Q26) An AM broadcasting station has a vertical telescopic transmitting antenna and a receiver has a vertical l telescopic antenna. The receiver will respond to Show Answer

Q27) A TV tower has a height of 100 m, By how much the height of tower be increased to triple its coverage range? Show Answer

Q28) The difference in the variation of resistance with temperature in a metal and a semiconductor arises essentially due to the difference in the Show Answer

Q29) Which of the following is best nuclear fuel ? Show Answer

Q30) In a material medium, when a positron meets an electron both the particles annihilate leading to the emission of two gamma ray photons. This process from the basis of an important diagnostic procedure called Show Answer

Q31) the science of communication involving long distance is known as Show Answer

Q32) For transmission of TV-signal, sound-part is Show Answer

Q33) Picture signal of TV-signal is Show Answer

Q34) Optical fibers are used for long distance communication because Show Answer

Q35) The service area of space wave communication increases by Show Answer

Q36) Electromagnetic waves with frequencies greater than the critical frequency of ionosphere cannot be used for communication using sky propagation because Show Answer

Q37) The phenomenon which can be explained only by quantum nature of light is Show Answer

Q38) Apollo-11 was sent on Show Answer

Q39) A 'back hole' is a body in space which does not allow any radiation to come out. this property is due to its: Show Answer

Q40) For reproducing sound , a CD(compact Disc) audio player users a Show Answer

Q41) Consider the following statements :
1) Short wave bands are used for transmission of radio waves to a large distance .
2) Short waves are reflected by ionosphere .
3) A pure semiconductors has negative temperature coefficient of resistance .
Which of the above statements are correct? Show Answer

Q42) Consider the following statements :
1) Though light of a single frequency (monochromatic light) is incident on a metal , the energies of emitted photo-electrons are different .
2) The energy of electrons just after they absorb photons incident on metal surface may be lost in collision with other atoms in the metal before the electron is ejected out of the metal.
3) The De-Broglie wavelength of a molecule ( in a sample of ideal gas ) varies inversely as the square root of absolute temperature.
Which of the above statement(s) is/ are correct? Show Answer

Q43) Consider the following statements :
1) Collation is a process of sorting at receiving end
2) Encoding of signal is requires for modulation at transmitting end.
3) Long wave broadcast transmitter are used or temperate countries. -
Which of the above statements are correct? Show Answer

Q44) space wave propagation is
1) tropospherical propagation
2) sky wave propagation
3) line of sight propagation
Which of the above statement(s) is/are correct? Show Answer

Q45) Consider the following statements in respect of India advanced satellite INSAT-4A
1) INSAT-4A was launched in December ,2005 from New Mexico.
2) The European Commercial Launch Service Provider Arianespace was associated with the launch of INSAT-4A
3) Tata-sky; a digital cable service provider, is associated with DTH television broadcasting service from INSAT-4A .
Which of the statements given above are correct? Show Answer

Q46) At the present level of technology available in India , solar energy can be convenient used to :
1) Supply hot water to residential buildings.
2) Supply water for minor irrigation projects.
3) Provide street lighting.
4) Electrify a cluster of villages and small towns.
Which of the statements given above are correct? Show Answer

Q47) Consider the following statements :
A Pearson in a spaceship located half way between the earth and the sun will notice that the:
1) Sky is jet black.
2) stars do not twinkle.
3) temperature outside the spaceship is much higher than that on the surface of the earth.
Which of the statement(s) given above is/are correct ? Show Answer

Q48) Consider the following statements :
1)A Geo-stationary satellite is at an approximate height of 10,000 km
2) FM transmission of music is of very good quality because the atmospheric or man made noises which are generally frequency variations can do little harm.
Which of the statements given above is/are correct ? Show Answer

Q49) Consider the following statements :
In a nuclear reactor, self-sustained chain reaction is possible, because
1) More neutrons are released in each of he fission reaction.
2) The neutron immediately take part in the fission process.
3) The fast neutrons are slowed down by graphite.
4) Every neutron released in the fission reaction initiates further fission.
Which of the statements given above are correct? Show Answer

Q50) Assertion : Short wave bands are used for transmission of radio waves to a large distance.
Reason : Short waves are reflected by ionosphere .
Show Answer

Q51) Assertion : Television signal cannot be propagate through sky-wave propagation.
Reason : The ionosphere reflects electromagnetic waves of frequencies greater than a certain frequency.
Show Answer

Q52) Assertion: The electrical conductivity of earth's atmosphere decreases with attitude.
Reason : The high energy particles (i.e., gamma-rays and cosmic rays ) coming from outer space and entering our earth's atmosphere cause ionization of the atoms of the gases present there and the pressure of gases decreases with increase in altitude . Show Answer

Q53) Assertion: Satellite is an ideal platform for remote sensing.
Reason : Satellite in polar orbit can provide global coverage or continuous coverage of the fixed area in geostationary configuration. Show Answer

Q54) Assertion: Optical finer communication has immunity to cross-talk.
Reason : Optical interference between fibers is zero. Show Answer

Q55) heavy water is used as a moderator in a nuclear reactor. The function of the moderator is Show Answer

Q56) Which one of the following is true ? Show Answer

Q57) If 50 g of a radioactive substance undergoes 50% distintegration in 2 min, then it would by 25% of initial weight in Show Answer

Q58) Assertion (A) Energy is produced by the sun.
Reason (R) Fusion leads energy.
Which one of the following is correct ? Show Answer

Q59) Which one of the following have number of free electrons to conduct electricity Show Answer

Q60) Which making n-type semiconductor silicon, we have the doping of Show Answer

Q61) The circuit diagram for AND gate is Show Answer

Q62) Consider the following statement(s).
1) Superconductivity does not occur in most of the ferrous metals.
2) It also does not occur in noble metals. (e.g., gold and silver).
Which of the above statement(s) is/are correct ?
Show Answer

Q63) When the national Superconductivity Science and Technology Board was constituted ? Show Answer

Q64) Which type of gas lasers generate deep ultraviolet wavelengths ? Show Answer

Q65) Which of the department mentioned below do not conduct research on superconductivity ? Show Answer

Q66) Which one of the following characteristics is not of laser light ? Show Answer

Q67) Light Emitting Diode (LED) con verts Show Answer

Q68) The electric current passing through a metallic wire produces heat because of Show Answer

Q69) Consider the following statements
1) In a charged capacitor, the energy is stored in the electric field between the plates.
2) The dielectric constant of metals is infinite.
3) he field intensity on the surface of a charged conductor is directed normally to the surface
4) Kirchhoff's voltage law is based on the law of conservation of energy.
Which of the statements given above are correct ? Show Answer

Q70) Consider the following statements
1) Constantan wire is used in making standard resistance because of resistance in negligible
2) Thermocouple thermometer is based on peltier effect.
3) Potentiometer measures potential more accurately because it measures potential in the open circuit.
4) In an electrolysis, the amount of mass deposited or liberated at an electrode is directly proportional to amount of charge.
Which of the statements given above are correct ? Show Answer

Q71) Long distance short radio broad casting uses Show Answer

Q72) The Liftport Group is dedicated to making the space elevator reality. Their target to complete this project in Show Answer

Q73) The Joint Nano Impact +Net-QNano conference took place from 27th to 29th February 2012. Where was the venue of this conference ? Show Answer

Q74) The project Sonodrug was in the news recently. They has a summer school on Biophysics of lipids and lipid protein interaction from biomembranes to the molecular engineering, drug delivery and imaging. The project is funded by Show Answer

Q75) The network preparations of NanobioNet were conferenced in February 2011 in Mexico city. Who was the initiator of his network ? Show Answer

Q76) Satellites used for telecommunication relay are kept in a geostationary orbit. A satellite is said to be in such an orbit when
1) The orbit is geosynchronous.
2) The orbit is circular
3) The orbit lies in the plane of the Earth's equator.
4) The orbit is at an altitude of 22,236 km.
Select the correct answer using the codes given below : Show Answer

Q77) A layer in the earth's atmosphere called Ionosphere facilitates radio communication. Why ?
1) The presence of ozone causes the reflection of radio waves to the earth.
2) Radio waves have a very long wavelength.
Which of the statements given above is/are correct ? Show Answer

Q78) Consider the following statements
1) A nuclear reactor is a device in which fission occurs at a controlled rate.
2) A nuclear reactor produces more fissionable material, then it burn.
3) Nuclear fuel, generally uranium that has been some what enriched in uranium-235 isotopes.
4) Generally graphite or heavy water is used as moderator.
Which of the following statement(s) is/are correct ? Show Answer

Q79) Which one of the following is an electromagnetic radiation of short wavelength ? Show Answer

Q80) During a nuclear fusion reaction Show Answer

Q81) Who among the following scientists shared the Nobel Prize in Physics with his son ? Show Answer

Q82) Unit of amount of substance is taken by an standard amount of Show Answer

Q83) Which of the following is the purpose of geostationary satellites for which they have been used ? Show Answer

Q84) Consider the following statement
1) Thousands of major planet lies between the orbits of mars and jupiter are known as Asteroides.
2) Asteroids is an irregular, rocky hunk small both in size and in mass compared to a planet.
3) Ceres, is the largest known Asteriod.
4) Asteriods are Debris left over from the accumulation process.
Which one of the following statement(s) is/are true ? Show Answer

Q85) pallas, Vesta, Hygeia are examples of which of the following ? Show Answer

Q86) A man inside an artificial satellite feels weightlessness because the force of attraction due to earth is Show Answer

Q87) Enriched uranium is Show Answer

Q88) The source of sun's energy is Show Answer

Q89) A radioactive substance has a half-life of four months. Three-fourth of the substance would decay in Show Answer

Q90) The alpha particle carries two positive charge. Its mass is very nearly equal to that of Show Answer

Q91) Which one of the following can be used to confirm whether drinking water contains a gamma emitting isotope or not ? Show Answer

Q92) The different between a nuclear reactor and an atomic bomb is that Show Answer

Q93) Barium in a suitable form is administered to patients before an X-ray examination of the stomach, because Show Answer

Q94) Radiocarbon dating is used to estimate the age of Show Answer

Q95) Which one of the following is not correctly matched ? Show Answer

Q96) Which of the following statements is true?
Show Answer

Q97) The energy on sun released due to- Show Answer

Q98) The stars receive their energy from which of the following ? Show Answer

Q99) Source of Energy from the Sun is Show Answer

Q100) What is the source of electrical energy in an artifical satellite ? Show Answer

Q101) Consider the following statements :
1. The most important technological application of liquid crystals is in digital display.
2. Modem is a device that is connected to a computer and to a phone line.
3. The National Institute of Oceanography is located at Coimbatore.
4. Virginis-70 is a system for recording video programmes.
Of these statements Show Answer

Q102) Which one of the following is not suitably matched ? Show Answer

Q103) “Indian Institute of naturopathy and Yogic Science” is located at: Show Answer

Q104) Water Jet Technology finds application in Show Answer

Q105) Laser beam is used for: Show Answer

Q106) The device used for converting alternating current to direct current is called Show Answer

Q107) In which of the following activities are Indian Remote Sensing (IRS) satellites used?
1. Assessment of crop productivity
2. Locating ground water resources
3. Mineral exploration
4. Telecommunications
5. Traffic studies
Select the correct answer using the code given below Show Answer

Q108) SMAP stands for Show Answer