Physics Questions And Answers 210-223

210. According to Newton’s second law of motion acceleration of an object is dependent upon two variables. Which are those two variables?
a. The net force acting upon the object and the mass of the object
b. The total force acting upon the object and the mass of the object
c. The net force acting upon the object and the velocity of the object
d. None of the above


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ANSWER: a. The net force acting upon the object and the mass of the object



211. An atom emits a photon when one of its orbital electrons
a. jumps from a higher to a lower energy level
b. jumps from a lower to a higher energy level
c. is removed by the photoelectric effect
d. is at rest

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ANSWER : : jumps from a higher to a lower energy level


212.  What is the main constituent of coal gas?  
A.  Oxygen
B.  Water
C.  Nitrogen
D.  Methane

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Answer : D.  Methane



213. What is the name given to the band of seven colors formed by splitting of light by a prism?  
a. Color Band
b. Spectrum Right!
c. Color Arc
d. Prism Band

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Answer : Spectrum


214. Force of gravity is least at -
A.  The equator
B.  The pole
C.  Between equator and pole
D.  None of these

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Answer : A.  The equator



215. The path followed by a projectile is called its?
a.   Territory
b.   Treasury
c.   Tractor
d.   Trajectory

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Answer : d. Trajectory


216.  What is the technique for reproducing a stereoscopic image without a lens or a camera ? 
a. thermography
b. chromatography
c. stereography
d. holography

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Answer : d. holography



217. What is the unit for Viscosity?
A. Coulomb                                                                                        
B. newton second per square meter
C. watt per meter per degree Celsius                                    
D. joule per kilogram per kelvin

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Ans. B



218. The speed of sound in water is four times its speed in air. When a sound wave of frequency 'n' and wavelength '?' 
enters from air into water, then its frequency and wavelength will respectively become -
1. 4n and ?
2. n and 4?
3. 2n and ?
4. None of these

Cover the Answer
Ans: 2


219. Which instrument is used to measure the scattering of light by particles suspended in a liquid ?
a. Nephetometer
b. Ohmmeter
c. Ondometer
d. Pyrometer

 Cover the Answer
Answer: Option A
Explanation:
Ohmmeter - is used to measure electrical resistance in ohms,
Ondometer - is used to measure frequency of electromagnetic waves,
Pyrometer - is used to measure very high temperature.



220.  A moderator is used in nuclear reactors in order to  
A.  increase the no.of.neutrons
B.  decrease the no.of.neutrons
C.  slow down the speed of neutrons
D.  Anthony S. D’Mello

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Answer : C.  slow down the speed of neutrons



221.   Light from the Sun reaches us in nearly
A. 2 minutes
B. 4 minutes
C. 8 minutes
D. 16 minutes

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Answer: C



222.  Ball bearings are used in cycles, scooters etc to
A) Increase the friction between the wheel and the axle
B) Reduce the friction between the wheel and the axle
C) Reduce the friction between ground and the whee
D) None of the above

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Answer: B) Reduce the friction between the wheel and the axle 



223. A woman’s voice is shriller than man’s voice due to
A. lower frequency
B. higher frequency
C. weak vocal chords
D. higher amplitude

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Answer: B. higher frequency

Physics Questions And Answers 196 - 206

196. What do you understand by inertia?
a. Ability of a substance to transfer heart energy to another physical system
b. Phenomenon observed whenever the source of waves is moving with respect to an observer
c. Tendency to resist changes in their state of motion
d. None of the above

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ANSWER: c. Tendency to resist changes in their state of motion


197. The potential energy of an electron in a given orbit is
a. equal to its kinetic energy
b. one half of its kinetic energy
c. twice its kinetic energy
d. twice its kinetic energy but negative

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ANSWER : : twice its kinetic energy but negative



198. The Central Arid Zone Research Institute (CAZRI) is located at  
A.  Jaipur
B.  Jodhpur
C.  Jaisalmer
D.  Jallandhar

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Answer : B.  Jodhpur



199. How much heat is required to raise the temperature of 1g of water by 1 oC.  
a. 100 Calories
b. 1 Joule
c. 1 Calorie 
d. 100 Joules

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Answer : 1 Calorie



200.  Lux is the SI unit of -
A.  Intensity of illumination
B.  Luminous efficiency
C.  Luminous flux
D.  Luminous intensity

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Answer : A.  Intensity of illumination



201. For one complete revolution θ =?
a.   360°
b.   90°
c.   180°
d.   45°

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Answer : a.   360°



202. Which of the following is most suitable for measuring very high temperatures ? 
a. thermocouple
b. pyrometer
c. thermoelectric thermometer
d. platinum resistance thermometer

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Answer : b. pyrometer


203. What is the unit for electric charge?
A. Ampere                          
B. Coulomb                         
D. Newton                          
D. Volt

Cover the Answer
Ans. B


204. The conduction current in a chemical cell is -
1. By Positive and negative ions
2. By Positive ions
3. By Negative ions
4. By Positive Holes

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Ans: 3



205. Which instrument is used to record physical happenings at a distant place ?
a. Thermostat
b. Tonometer
c. Telemeter
d. Transponder

Cover the Answer
Answer: Option C
Explanation:
Thermostat - is used to regulate the temperature at a particular point.
Tonometer - is used to measure the pitch of a sound,
Transponder - is used to receive a signal and transmit a reply immediately.



206. Mesons are found in  
A.  Alpha -rays
B.  Laser beam
C.  X – rays
D.  Cosmic rays

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Answer : D.  Cosmic rays



207. Mirage is due to
A. unequal heating of different parts of the atmosphere
B. magnetic disturbances in the atmosphere
C. depletion of ozone layer in the atmosphere
D. equal heating of different parts of the atmosphere

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Answer: A


208. Masses of stars and galaxies are usually expressed in terms of
A) neutron mass
B) earth's mass
C) solar mass
D) lunar mass

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Answer: C) solar mass 



209. Which one of the following common devices works on the basis of the principle of mutual induction?
A. LED
B. Transformer
C. Photodiode
D. Tube light

Cover the Answer
Answer : B. Transformer

Physics Questions And Answers 182-195

182. ‘An object at rest stays at rest and object in motion stays in motion with the same speed and in the same direction 
unless acted upon by an unbalanced force.’ This is which law of Newton?
a. First law of motion
b. Second law of motion
c. Third law of motion
d. None of the above

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ANSWER: a. First law of motion


183. Which of the following series of hydrogen spectral lines occurs in the ultraviolet region
a. Bracket series
b. Pfund series
c. Balmer series
d. Lyman series

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ANSWER : : Lyman series


184. Which one among the following radiations carries maximum energy?  
A.  Ultraviolet rays
B.  Gamma rays
C.  X- rays
D.  Infra red rays


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Answer : B.  Gamma rays



185. Which of the following is attracted by a magnet?
a. Rubber
b. Leather
c. Iron 
d. Glass

Cover the Answer
Answer : c   Iron



186. What is the unit for specific resistance?
A.  Ohm / cm
B.  Ohm – cm2
C.  Ohm – cm
D.  Ohm

Cover the Answer
Answer : C.  Ohm – cm



187. The total flight requires a time that is?
a.   four times the time necessary to reach the maximum height.
b.   thrice the time necessary to reach the maximum height
c.   twice the time necessary to reach the maximum height
d.   equal to the time necessary to reach the maximum height.

Cover the Answer
Answer :  twice the time necessary to reach the maximum height



188. The underwater analogue of microphone is: 
a. sonobuoy
b. megaphone
c. hydrophone
d. acoustic tropedo

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Answer : c. hydrophone


189. _____ Instrument is used for measuring sound under water?
A. Hygrometer                  
B. Hygroscope                   
C. Hypsometer                  
D. Hydrophone

Cover the Answer
Ans. D



190. Which two colours can be mixed to make green?
1. Yellow and Balck
2. Yellow and Blue
3. Orange and Violet
4. Purple and Yellow


Cover the Answer
Ans: 2




191. Which instrument is used to measure curvature of spherical objects ?
a. Spectroscope
b. Spherometer
c. Spectrometer
d. Sextant

Cover the Answer
Answer: Option B
Explanation:
Spectroscope - used to record spectra,
Spectrometer - used to measure the position of spectral lines,
Sextant - used to measure the height of very distant objects and also used by navigators to find the latitude. what you 
thought :)



192. Dc current can be controlled by which one of the following components?  
A. Impedance
B. Resistance
C. Capacitance
D. Inductance

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Answer : B. Resistance




193. Light year is a unit of
A. time
B. distance
C. light
D. intensity of light

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Answer: B




194. Which of the following is not the unit of time
A) Parallactic second
B) Micro Second
C) Leap year
D) Solar day

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Answer: A) Parallactic second




195.  Which one of the following is the unit of activity of a radioactive source?
A. Siemens
B. Lux
C. Tesla
D. Becquerrel

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Answer: D. Becquerrel

Physics Questions And Answers 167- 181

167. Increasing force tends to ____while increasing mass tends to ___
a. Increase acceleration, decrease acceleration
b. Increase acceleration, increase acceleration
c. Decrease acceleration, increase acceleration
d. Decrease acceleration, decrease acceleration


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ANSWER: a. Increase acceleration, decrease acceleration



168. According to Bohr’s atom model, the angular momentum of the electron in its non-radiating orbit is in integer multiple of the quantity
a. h/4p
b. h/2p
c. 2p/h
d. h/p

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ANSWER : : h/2p




169. On which one of the following conservation laws, does a rocket work?  
A.  Mass
B.  Energy
C.  Linear momentum
D.  Angular momentum

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Answer : D.  Angular momentum


170. The presence of charge on a substance can be confirmed by a   
a. Electrodes
b. Ammeter
c. Thermometer
d. Gold Leaf Electroscope 


Cover the Answer
Answer : D.



171. Sound wane in air are -
A.  Transverse
B.  Longitudinal
C.  Electromagnetic
D.  Polarised

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Answer : B.  Longitudinal




172. The motion of a projectile follows a?
a.   vertical path.
b.   spinning path.
c.   straight path.
d.   curved path.

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Answer : d.   curved path.



173. Name the device for detecting and measuring small amount thermal energy :
a. barretter
b. pyrometer
c. pyranometer
d. bolometer

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Answer : d. bolometer



174. What is the value of acceleration of a body moving with constant velocity?
A. One                                  
B. Two                                  
C. Three                               
D. Zero

Cover the Answer
Ans. D



175. Which instrument is used in submarine to see the objects above sea level ?
a. Pykometer
b. Polygraph
c. Photometer
d. Periscope

Cover the Answer
Answer: Option D
Explanation:
Pykometer - used to determine the density and coefficient of expansion of liquids,
Polygraph - used to record changes in heartbeat, blood-pressure and respiration,
Photometer - used to compare luminous intensity of the source of light.




176. Which one of the following common devices works on the basis of the principle of mutual induction?  
A.  Tubelight
B.  Transformer
C.  Photodiode
D.  Led

Cover the Answer
Answer : B.  Transformer





177. Nuclear sizes are expressed in a unit named
A. Fermi
B. angstrom
C. newton
D. tesla

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Answer: A
Fermi - A unit of length equal to 10-15 meter (one femtometer), used in nuclear physics. It is similar to the diameter of a proton.



178. The ringing of an electric bell in an enclosed evacuated glass bell jar is not heard outside because  
A) the ringing is not loud enough
B) the glass of the bell jar absorbs the sound waves
C) the bell jar is too small
D) there is no air or any other gas in the bell jar

Cover the Answer
Answer: D) there is no air or any other gas in the bell jar 
Explanation:
As there is no medium inside the bell jar, sound cannot travel




179. Which one of the following is used as a moderator in nuclear reactor
A. radium
B. graphite
C. thorium
D. ordinary water

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Answer: B. graphite



180. Temperature can be expressed as derived quantity in terms of any of the following
A) length and mass
B) mass and time
C) length,mass and time
D) in terms of none

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Answer: D) in terms of none 



181. The minimum number of Non zero non collinear vectors required to produce a zero vector is
A) 3
B) 2
C) 4
D) 1

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Answer: A) 3

Physics Questions And Answers 154 - 166

154. The acceleration of an object is ____
a. Directly proportional to force
b. Inversely proportional to mass
c. Directly proportional to force and inversely proportional to mass
d. Directly proportional to mass and indirectly proportional to force

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ANSWER: c. Directly proportional to force and inversely proportional to mass



155. The nucleus is a sphere of radius about
a. 10-11 m
b. 10-12 m
c. 10-13 m
d. 10-14 m

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ANSWER : : 10-14 m



156. What element’s three isotopes have different names?  
A. Helium
B. Oxygen
C. Carbon
D. Hydrogen

Cover the Answer
Answer : D. Hydrogen




157. A freely suspended magnet always aligns itself along the  
a. East South Axis
b. North South Axis 
c. East West Axis
d. West South Axis

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Answer :  North South Axis


158. Which of the following is not a good heat insulator?   
a. Wood
b. Iron Right!
c. Wool
d. Feathers

Cover the Answer
Answer : Iron




159.  Which one of the following quantities does not have the unit?
A.  Stress
B.  force
C.  Strain
D.  Pressure

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Answer : C.  Strain



160.   A player making a long jump is an example of?
a.   Rotatory motion.
b.   Projectile motion.
c.   Spinning motion.
d.   Horizontal motion.

Cover the Answer
Answer : B  Projectile motion.


161. An instrument for measuring focal length of a lens is called : 
a. focometer
b. goniometer
c. heliometer
d. spherometer

Cover the Answer
Answer : a. focometer



162.  The Electric circuit which changes its direction at regular intervals of time is called ___
A. Alternating Current   
B. Direct Current              
C. Three phase current  
D. All the above

Cover the Answer
Ans. A



163.  Electric fuse wire is made of alloys because alloys -
1. Have low melting point
2. Have high melting point
3. Are economical
4. Do not get heated easily

Cover the Answer
Ans: 1  



164. Which instrument is used to measure the power of electric circuit ?
a. Voltmeter
b. Wattmeter
c. Wavemeter
d. Viscometer

Cover the Answer
Answer: Option B
Explanation:
Voltmeter - is used to measure electric potential difference between two points,
Wavemeter - is used to measure the wavelength of a radiowave,
Viscometer - is used measure viscosity of liquid.



165. A piece of stone and or iron traveling through space that moves through the earth’s atmosphere is  
A.  Planet
B.  Sun
C.  Moon
D.  Meteor

Cover the Answer
Answer : D.  Meteor



166. Power reactor is located in Tamil Nadu at
 A. Kalpakkam
B. Sriharikota
C. Tuticorn
D. Pudukottai

Cover the Answer
Answer: A. Kalpakkam