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MCQOPTIONS
This section includes 2016 Mcqs, each offering curated multiple-choice questions to sharpen your General Knowledge knowledge and support exam preparation. Choose a topic below to get started.
| 851. |
A rear-view mirror for driving is |
| A. | lain |
| B. | oncave |
| C. | onvex |
| D. | nverted |
| Answer» D. nverted | |
| 852. |
Total internal reflection can not take place when light goes from : |
| A. | lass to water |
| B. | ater to glass |
| C. | ater to air |
| D. | lass to air |
| Answer» C. ater to air | |
| 853. |
A periscope works on the principle of |
| A. | efraction |
| B. | otal internal reflection |
| C. | iffraction |
| D. | eflection |
| Answer» C. iffraction | |
| 854. |
The angle between the ________ and the incident ray is called the angle of incidence. |
| A. | urface |
| B. | ormal |
| C. | angent |
| D. | eflected ray |
| Answer» C. angent | |
| 855. |
Optical fibres are based on the phenomenon of |
| A. | nterference |
| B. | ispersion |
| C. | iffraction |
| D. | otal Internal Reflection |
| Answer» E. | |
| 856. |
A mirage occurs because of |
| A. | eflection by hot ground |
| B. | otal internal reflection by layers of air |
| C. | nterference of light |
| D. | iffraction of light |
| Answer» C. nterference of light | |
| 857. |
Convex mirror is generally used in ________ |
| A. | olar cookers |
| B. | pthalmoscope |
| C. | eflector for head light |
| D. | ear view mirror |
| Answer» E. | |
| 858. |
After reflection from a plane mirror the word will look like. |
| A. | MBULANCE |
| B. | CNALUBMA |
| C. | MBULA CE |
| D. | WBULANCE |
| Answer» C. MBULA CE | |
| 859. |
The type of mirror used in automobiles to see the traffic on the rear side is |
| A. | oncave |
| B. | lano-Convex |
| C. | lane |
| D. | onvex |
| Answer» E. | |
| 860. |
Which type of mirror is used in the head lights of vehicles ? |
| A. | lane mirror |
| B. | oncave mirror |
| C. | onvex mirror |
| D. | arabolic mirror |
| Answer» C. onvex mirror | |
| 861. |
In which one of the following the phenomenon of total internal reflection of light is used ? |
| A. | ormation of mirage |
| B. | orking of binoculars |
| C. | ormation of rainbow |
| D. | winkling of stars |
| Answer» B. orking of binoculars | |
| 862. |
Cloudy nights are warmer compared to clear cloudless nights, because clouds mainly |
| A. | bsorb heat from the atmosphere send it towards earth |
| B. | revent cold waves from the sky descending on earth |
| C. | eflect back the heat given by earth |
| D. | roduce heat and radiate it toward earth |
| Answer» D. roduce heat and radiate it toward earth | |
| 863. |
The snow on the mountains does not melt all at once when it is heated by the sun because: |
| A. | t becomes very hard |
| B. | t reflects most of the heat from the sun |
| C. | t has a low specific heat capacity |
| D. | t has a high latent heat of fusion |
| Answer» C. t has a low specific heat capacity | |
| 864. |
When a body is immersed in a liquid, the force acting on it is |
| A. | pthrust |
| B. | eight |
| C. | ass |
| D. | oth (A) and (B) |
| Answer» E. | |
| 865. |
When a ship enters the sea from a river what will be the effect? |
| A. | t lowers |
| B. | t sways |
| C. | t rises a little |
| D. | t jolts |
| Answer» D. t jolts | |
| 866. |
An egg sinks in soft water but floats in a concentrated solution of salt because |
| A. | gg absorbs salt from the solution and expands |
| B. | lbumin dissolves in salt solution and egg becomes lighter |
| C. | he density of salt solution exceeds the density of eggs |
| D. | ater has high surface tension |
| Answer» D. ater has high surface tension | |
| 867. |
A piece of wood is held under water. The upthrust on it will be: |
| A. | qual to the weight of the wood |
| B. | ess than weight of the wood |
| C. | ore than weight of the wood |
| D. | ero |
| Answer» C. ore than weight of the wood | |
| 868. |
It is easier for a man to swim in sea water, than in river water because |
| A. | he density of sea water is lesser than the density of river water |
| B. | he density of sea water is more than the density of river water |
| C. | he sea is-deeper than the river |
| D. | he sea is wider than the river |
| Answer» C. he sea is-deeper than the river | |
| 869. |
When a piece of stone is immersed in water, it displaces water of equal |
| A. | ensity |
| B. | pecific gravity |
| C. | ass |
| D. | olume |
| Answer» D. olume | |
| 870. |
What is the principle of a ''Life Jacket"? |
| A. | t provides oxygen to a drowning person |
| B. | t increases the volume of the person to keep him afloat |
| C. | t decreases the volume of the person to keep him afloat |
| D. | he person can sit on it like a raft |
| Answer» C. t decreases the volume of the person to keep him afloat | |
| 871. |
A boat will submerge when it displaces water equal to its own: |
| A. | olume |
| B. | eight |
| C. | urface area |
| D. | ensity |
| Answer» C. urface area | |
| 872. |
A hydrogen balloon floats up because of |
| A. | ir pressure decreases with decrease in height |
| B. | ir pressure decreases with decrease in weight |
| C. | eight of the balloon is less than the weight of air displaced by it. |
| D. | he pressure inside the balloon is more than the pressure outside it |
| Answer» D. he pressure inside the balloon is more than the pressure outside it | |
| 873. |
The absolute zero is a temperature at which ________ |
| A. | olecular motion in a gas would cease |
| B. | ater freezes |
| C. | ll gases become liquid |
| D. | ll gases become solid |
| Answer» B. ater freezes | |
| 874. |
Earliest thermometer was developed by |
| A. | elsius |
| B. | ahrenheit |
| C. | elvin |
| D. | alileo |
| Answer» E. | |
| 875. |
A gas thermometer is more sensitive than a liquid thermometer because a gas : |
| A. | s lighter than liquid |
| B. | xpands more than a liquid |
| C. | s easy to obtain |
| D. | oes not change state easily |
| Answer» C. s easy to obtain | |
| 876. |
A solid needle placed horizontally on the surface of the water floats due to |
| A. | apillary action |
| B. | ater pressure |
| C. | urface tension of water |
| D. | iscosity of water |
| Answer» D. iscosity of water | |
| 877. |
The magnitude of buoyant force depends on the ________ of the fluid. |
| A. | ass |
| B. | emperature |
| C. | olume |
| D. | ensity |
| Answer» E. | |
| 878. |
The apparent weight of a man in a lift is less the real weight when : |
| A. | he lift is going up with an acceleration |
| B. | he lift is going down with uniform speed |
| C. | he lift is going up with uniform speed |
| D. | he lift is going down with an acceleration |
| Answer» E. | |
| 879. |
When a ship enters the sea from a river |
| A. | t rises a little |
| B. | t sinks a little |
| C. | t remains at the same level |
| D. | t rises or sinks depending on the material it is made of |
| Answer» B. t sinks a little | |
| 880. |
Clouds float in the atmosphere because of their |
| A. | ow pressure |
| B. | ow density |
| C. | ow viscosity |
| D. | ow temperature |
| Answer» C. ow viscosity | |
| 881. |
A light ray travelling from denser to rarer medium at an angle of incidence more than critical angle of concerned media pair suffers. |
| A. | eflection |
| B. | efraction |
| C. | iffraction |
| D. | otal internal reflection |
| Answer» E. | |
| 882. |
In mirrors the back surface is coated with a thin layer of : |
| A. | ercury |
| B. | ilver |
| C. | ed oxide |
| D. | ilver nitrate |
| Answer» C. ed oxide | |
| 883. |
The device used for locating submerged objects under sea is. |
| A. | onar |
| B. | adar |
| C. | aser |
| D. | aser |
| Answer» B. adar | |
| 884. |
The bats can fly in the dark because |
| A. | hey can see the objects in darkness |
| B. | hey have weak legs and are likely to be attacked by predators |
| C. | hey generate flashes of light |
| D. | hey generate ultrasonic sound waves |
| Answer» E. | |
| 885. |
When two similar sources vibrate with slightly different frequencies, a regular rise and fall occurs in the loudness of tone. This phenomenon is known as |
| A. | oppler effect |
| B. | eats |
| C. | esonance |
| D. | cho |
| Answer» C. esonance | |
| 886. |
The propagation of sound waves in a gas involves |
| A. | diabatic compression and rarefaction |
| B. | sothermal compression and rarefaction |
| C. | sochoric compression and rarefaction |
| D. | sobaric compression and rarefaction |
| Answer» B. sothermal compression and rarefaction | |
| 887. |
Velocity of sound in air does not change with the change of |
| A. | emperature of air |
| B. | ressure of air |
| C. | oisture content in air |
| D. | ind in the direction of propagation of sound |
| Answer» C. oisture content in air | |
| 888. |
Which one among the following doesn't have any effect on velocity of sound ? |
| A. | ressure |
| B. | emperature |
| C. | umidity |
| D. | ensity |
| Answer» D. ensity | |
| 889. |
The velocity of sound in moist air is more than in dry air because the moist air has |
| A. | ess density than dry air. |
| B. | ess pressure than dry air. |
| C. | ore pressure than dry air. |
| D. | ore density than dry air. |
| Answer» B. ess pressure than dry air. | |
| 890. |
If we want to calculate the pressure of a liquid at the bottom of a vessel, the quantity which is not required to determine it, is |
| A. | eight of the liquid column |
| B. | urface area of the bottom of the vessel |
| C. | ensity of the liquid |
| D. | cceleration due to gravity at the bottom of the vessel |
| Answer» C. ensity of the liquid | |
| 891. |
The hydraulic brakes used in automobiles is a direct application of : |
| A. | rchimedes' principle |
| B. | oricellian law |
| C. | ernoulli's theorem |
| D. | ascal's law |
| Answer» E. | |
| 892. |
Air moves from the region where the air ________ |
| A. | umidity is high to the region where the humidity is low |
| B. | ressure is low to the region where the pressure is high |
| C. | ressure is high to the region where the pressure is low |
| D. | umidity is low to the region where the humidity is high |
| Answer» D. umidity is low to the region where the humidity is high | |
| 893. |
What principle/law explains the working of the hydraulic brakes in automobiles ? |
| A. | ernoulli's law |
| B. | osieulle's principle |
| C. | ascal's law |
| D. | rchimedes' principle |
| Answer» D. rchimedes' principle | |
| 894. |
Hydraulic brakes work on the principle of |
| A. | homson's law |
| B. | ewton's law |
| C. | ernoulli's theorem |
| D. | ascal's law |
| Answer» E. | |
| 895. |
The Hydraulic Break works on the principle of ________ . |
| A. | ascal's Law |
| B. | oyle's law |
| C. | oulomb's law |
| D. | ernouli's law |
| Answer» B. oyle's law | |
| 896. |
Why is it difficult to breathe at higher altitudes? |
| A. | ue to low air pressure |
| B. | ue to low temperature |
| C. | ue to ozone |
| D. | ue to high humidity |
| Answer» B. ue to low temperature | |
| 897. |
The pressure exerted by a 760 mm column of mercury at 0°C is known as |
| A. | pascal |
| B. | atmosphere |
| C. | bar |
| D. | poise |
| Answer» B. atmosphere | |
| 898. |
When a barometer reading suddenly recedes, it indicates that climate– |
| A. | ill be very warm |
| B. | ill be extremely stormy |
| C. | ill remain cold |
| D. | ncessant rain for at least 48 |
| Answer» C. ill remain cold | |
| 899. |
Why do birds not have respiratory trouble at the time of flying at high altitude ? |
| A. | heir lungs are very large |
| B. | hey fly inactively |
| C. | hey have extra air sacs |
| D. | hey use less oxygen |
| Answer» D. hey use less oxygen | |
| 900. |
A vacuum cleaner works on the principle of pressure difference. On the moon it will |
| A. | ork as efficiently as on the earth |
| B. | ot work at all |
| C. | ork with reduced efficiency |
| D. | ork with increased efficiency |
| Answer» C. ork with reduced efficiency | |