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Physics-భౌతిక శాస్త్రం

important Previous Questions

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PART-4 from 151-200 Questions    

Q151. the density of gas is maximum at
(a) Low temperature low pressure
(b)Low temperature high pressure
(c)High temperature low pressure
(d)High temperature high pressure

Ans=B
Q152.Why is it difficult to breathe at higher altitudes?
(a)Due to low air pressure
(b)Due to low temperature
(c) Due to ozone
(d)Due to high humidity

Ans=A
Q153.The strongest force in nature is
(a)electrical force
(b)gravitational force
(c)nuclear force
(d)magnetic force

Ans=C

Q154. According to the theory of relativity which of the following alt ways remains constant ?
(a)Length of an object
(b)Time
(c)Space
(d)Velocity of light

Ans=D
Q155. The spoon dropped by an astronaut in a satellite will
(a)fall to the floor
(b)remain stationary
(c) continue to follow the motion of the satellite
(d) move tangentially away

Ans=C
Q156. Pipelines in cold countries often burst in winter because
(a)water freezes and expands in its volume
(b)temperature of ice is less than that of water
(c)pipelines contract in their volume
(d)pipelines expand due to freezing

Ans=A
Q157. When a body is taken from earth to moon
(a) mass changes but weight remains same
(b)weight changes but mass remains same
(c)both weight and mass change
(d)both weight and mass remain same

Ans=B
Q158. A mirage occurs because of
(a)reflection by hot ground
(b) total internal reflection by layers of air
(c)interference of light
(d)diffraction of light

Ans=B
Q159. Atomic power plant works on the principle of
(a) fission
(b)fusion
(c)thermal combustion
(d)combined effect of all the above three

Ans=A
Q160. Bolometer is used to measure
(a) Frequency
(b) Temperature
(c) Velocity
(d) Wavelength

Ans=B

From 161-170

Q161. ATM stands for
(a)Automatic Teller Machine
(b)Automated Teller Machine
(c)Automatic Tally Machine
(d). Automated Tally Mechanism

Ans=A
Q162. A person is hurt on kicking a stone due to
(a) Inertia
(b) Velocity
(c) Reaction
(d) Momentum

Q162. ఒక వ్యక్తి రాయిని తన్నడం వలన గాయపడతాడు———

(ఎ) జడత్వం

(బి) వేగం

(సి) ప్రతిచర్య

(డి) మొమెంటం

 

Ans=C

Physics Previous Questions Railway NTPC & group D 2020 part-4

Q163. The fuse in pure domestic electric circuit melts when there is a high rise in
(a) Inductance
(b) Current
(c) Resistance
(d) Capacitance

Ans=B
Q164. Which of the following is an example for cantilever beam?
(a) Diving board
(b) Bridge
(c)Seesaw
(d)Common balance

Ans=B
Q165. UK It is difficult to cook rice
(a) at the top of a mountain
(b) at the sea level
(c) under a mine
(d) same anywhere

Ans=A
Q166. A dynamo is a device which
(a) creates mechanical energy
(b) creates electrical energy
(c)converts mechanical energy into electrical energy
(d) converts electrical energy into mechanical energy

Ans=C
Q167. A soap bubble shows colors when illuminated with white light. This is due to
(a)Diffraction
(b)Polarization
(c) Interference
(d)Reflection

Ans=C
Q168. The Instrument used to see the distant objects on the Earth is
(a)Terrestrial telescope
(b)Astronomical telescope
(c)Compound microscope
(d)Simple microscope

Ans=A

Physics Previous Questions Railway NTPC & group D 2020 Part-4
Q169. Global warming is expected to result in
(a)increase in level of sea
(b)change in crop pattern
(c)change in coast line
(d)All of the above

Ans=D
Q170. Which of the following liquids has the least density ?
(a)Fresh water
(b)Salt water
(c)Petrol
(d)Mercury

Ans=C

From 171-180

Q171. Which of the following principle is used to produce low temperatures ?
(a)Superconductivity
(b)Joule Kelvin effect
(c)Thermoelectric effect
(d) Adiabatic demagnetization

Ans=D
Q172.A photoelectric cell converts
(a)mechanical energy to electric energy
(b)heat energy to mechanical energy
(c)light energy to chemical energy
(d)light energy to electrical energy

Ans=D
Q173. Two stones of different masses are dropped simultaneously from the top of a building
(a)Smaller stone reaches the ground earlier
(b)Larger stone reaches the ground earlier
(c)Both the stones reach the ground at the same time
(d) None of the Above

Ans=C
Q174. The device used to change the speed of an electric fan is
(a) Amplifier
(b) Regulator
(c) Switch
(d) Rectifier

Ans=B
Q175.Fog is an example of
(a)Gas dispersed in gas
(b)Liquid dispersed in gas
(c)Solid dispersed in gas
(d)Solid dispersed in liquid

Ans=B
Q176. A concave lens always forms an image which is
(a)real and erect
(b)virtual and erect
(c)real and inverted
(d)virtual and inverted

Ans=B
Q177. The modulus of rigidity Is the ratio of
(a)longitudinal stress to longitudinal strain
(b)Volume stress to volume strain
(c)shearing stress to shearing strain
(d)tensile stress to tensile strain

Ans=C
Q178. The propagation of sound waves in a gas involves
(a)adiabatic compression and rarefaction
(b)isothermal compression and rarefaction
(c)isochoric compression and rarefaction
(d)isobaric compression and rarefaction

Ans=A
Q179. Heat transfer horizontally within the atmosphere Is called
(a)Conduction
(b)Convection
(c)Absorption
(d)Advection

Ans=D
Q180. Noise is measured In
(a) Watt
(b) REM
(c) Centigrade
(d) Decibel

Ans=D

Physics Previous Questions Railway NTPC & group D 2020 from 151-200

From 181-190

Q181. The bats(గబ్బిలాలు) can fly in the dark because
(a)they can see the objects in darkness
(b)they have weak legs and are likely to be attacked by predators
(c)they generate flashes of light
(d)they generate ultrasonic sound waves

Ans=D
Q182. What changes will happen to a bowl of ice and water kept at exactly zero degree Celsius ?
(a)All ice will melt
(b)All water will become ice
(c)No change will happen
(d)Only some ice will melt

Ans=C

Q183. Cupric point is the temperature at which
(a)Matter becomes radioactive
(b)A metal loses magnetic properties.
(c)A metal loses conductivity
(d)Transmutation of metal

Ans=B
Q184. Angle of friction and angle of repose are
(a)equal to each other
(b)not equal to each other
(c)proportional to each other
(d) None of the above

Ans=A
Q185. If a boy sitting in a train which is moving at a constant velocity throws a ball straight up into the air the ball will
(a) fall in front of him
(b) fall behind him
(c)fall into his hand
(d)None of the above

Ans=C
Q186. Intensity of gravitational field of earth is maximum at
(a)Poles
(b)Equator
(c) Centre of earth
(d) Surface

Ans=A
Q187. The spokes Used in the wheel of a bicycle increase its
(a)Moment of inertia
(b)Velocity
(c)Acceleration
(d) Momentum

Ans=A

Q188. A transformer works on the principle of
(a)Self induction
(b)Mutual induction
(c)Generator
(d)Inverter

Ans=B
Q189. The sky appears blue because
(a)all colors interfere to produce blue
(b)in white light the blue component dominates
(c)the atmosphere scatters blue color more than the others
(d) it is actually blue

Ans=C
Q190. When a ship enters the sea from a river
(a)it rises a little
(b)it sinks a little
(c)It remains at the same level
(d)it rises or sinks depending on the material it is made of

Ans=A

From 191-200

Q191.Two stones of unequal masses are thrown vertically up with the same velocity. Which of the following will happen?
(a)The heavier mass will reach greater height
(b)The lighter mass will reach greater height
(c)Both will reach the same height
(d)Any of them may reach great height

Ans=C
Q192. The unit of electrical power is
(a)Volt
(b) Watt
(c) Kilowatt hour
(d) Ampere

Ans=A
Q193. The scientist who first sent electromagnetic waves to distant places is
(a)James Clerk Maxwell
(b)Heinrich Hertz
(c)Thomas Alva Edison
(d)John Logie Baird

Q193. మొట్టమొదట విద్యుదయస్కాంత తరంగాలను సుదూర ప్రాంతాలకు పంపిన శాస్త్రవేత్త

(ఎ) జేమ్స్ క్లర్క్ మాక్స్వెల్

(బి) హెన్రిచ్ హెర్ట్జ్

(సి) థామస్ అల్వా ఎడిసన్

(డి) జాన్ లోగి బైర్డ్

Ans=C
Q194. The centre of gravity of a sprinter during the race lies
(a)ahead of his feet
(b)behind his feet
(c)at the centre of the body
(d)to the left side of the body

Q194. రేసులో స్ప్రింటర్ యొక్క గురుత్వాకర్షణ కేంద్రం—— ఉంది

(ఎ) తన పాదాల ముందు

(బి) అతని పాదాల వెనుక

(సి) శరీరం మధ్యలో

(డి) శరీరం యొక్క ఎడమ వైపు

Ans=A

Q195. Cloudy nights are warmer compared nights because clouds mainly
(a)absorb heat from the atmosphere send it towards earth
(b) prevent cold waves from the sky descending on earth
(c)reflect back the heat given by earth
(d)produce heat and radiate toward earth

Ans=C

Questions From 196-200

Q196. A metal plate with a circular hole at the centre is heated. What will happen to the area of the hole ?
(a)Increase
(b)Decrease
(c)Remain constant
(d)Will increase first and then decrease

Ans=A
Q197. The period of revolution of a geo stationary satellite is
(a)365 days
(b)30 days
(c)24 hours
(d)changing continuously

Ans=C
Q198. 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 ?
(a) They must have the same volume
(b)They must have the same density
(c) They must have the same mass
(d) They must be dropped in vacuum

Ans=D
199. The frequency of ultrasound wave is typically
(a)Above 20 kHz
(b)Above 20000 kHz
(c)Below 20 kHz
(d)Below 02 kHz

Ans=C
200 Which type of reaction produces the most harmful radiation ?
(a)Fusion reaction ( సూర్యుడు)
(b)Fission reaction( న్యూక్లియర్ రియాక్టర్)
(c)Chemical reaction
(d)Photo Chemical reaction

Ans=B

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