MCQOPTIONS
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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.
| 801. |
The device used to change the speed of an electric fan is |
| A. | mplifier |
| B. | egulator |
| C. | witch |
| D. | ectifier |
| Answer» C. witch | |
| 802. |
Electricity is transmitted over long distances |
| A. | t is fast |
| B. | here is less wastage of energy |
| C. | t is safer |
| D. | t is cheaper |
| Answer» C. t is safer | |
| 803. |
The coil wire in the electric room heater or electric cooking heater is called ________ |
| A. | ircuit |
| B. | lement |
| C. | ilament |
| D. | ells |
| Answer» C. ilament | |
| 804. |
The filament of electric bulb is made up of : |
| A. | opper |
| B. | ichrome |
| C. | ead |
| D. | ungsten |
| Answer» E. | |
| 805. |
If a copper wire is increased to double its length, its resistance will become |
| A. | our times |
| B. | ne–fourth |
| C. | ouble |
| D. | alf |
| Answer» B. ne–fourth | |
| 806. |
If electric resistance is to be decreased, then the number of resistances should be connected in ________ |
| A. | eries |
| B. | arallel |
| C. | ixed arrangement |
| D. | one of these |
| Answer» C. ixed arrangement | |
| 807. |
What is the effective resistance (in Ω) of two resistors 20 Ω and 30 Ω connected in parallel? |
| A. | 0 |
| B. | 2 |
| C. | 4 |
| D. | 6 |
| Answer» C. 4 | |
| 808. |
Water cannot be used to extinguish fire caused by electric current, because |
| A. | t may cause electrocution |
| B. | t may cause hydrolysis |
| C. | t may cause electrolysis |
| D. | t may spoil the wiring |
| Answer» B. t may cause hydrolysis | |
| 809. |
A good conductor while carrying current is |
| A. | lternately charged positive and negative |
| B. | egatively charged |
| C. | ositively charged |
| D. | lectrically neutral |
| Answer» C. ositively charged | |
| 810. |
Which of the following is a good conductor of heat but a bad conductor of electricity ? |
| A. | elluloid |
| B. | ubber |
| C. | sbestos |
| D. | ica |
| Answer» E. | |
| 811. |
A copper wire of radius r and length l has a resistance of R. A second copper wire with radius 2r and length l is taken and the two wires are joined in a parallel combination. The resultant resistance of the parallel combination of the two wires will be |
| A. | R |
| B. | R/4 |
| C. | R/5 |
| D. | /5 |
| Answer» E. | |
| 812. |
Find the resistance (in mega) of a wire of length 20m, cross sectional area 1 cm2 and made of a material of resistivity 200m. |
| A. | 0 |
| B. | 000 |
| C. | 0 |
| D. | 000 |
| Answer» B. 000 | |
| 813. |
Steam at 100°C causes more severe burns than water at 100°C because |
| A. | team has no specific heat capacity |
| B. | team has latent heat of vaporisation |
| C. | ater has no specific heat capacity |
| D. | ater has latent heat of fusion |
| Answer» C. ater has no specific heat capacity | |
| 814. |
Which of the following represents a relation for ''heat lost = heat gained'? |
| A. | rinciple of thermal equilibrium |
| B. | rinciple of colors |
| C. | rinciple of calorimetry |
| D. | rinciple of vaporization |
| Answer» D. rinciple of vaporization | |
| 815. |
Water pipes in hilly areas often burst on a cold frosty night, because |
| A. | he material of which pipes are made contracts due to cold and so breaks |
| B. | ater in the pipes freezes and on freezing water expands, so pipes break |
| C. | rost makes the pipes rusty, so they break |
| D. | one of these |
| Answer» C. rost makes the pipes rusty, so they break | |
| 816. |
How much mechanical work must be done to completely melt 1 gram of ice at 0°C ? |
| A. | .2 J |
| B. | 0 J |
| C. | 36 J |
| D. | 268 J |
| Answer» C. 36 J | |
| 817. |
Water is used in car radiator because of its |
| A. | ow density |
| B. | asy availability |
| C. | igh specific heat capacity |
| D. | ow boiling point |
| Answer» D. ow boiling point | |
| 818. |
Water is not suitable as a calorimetric substance because it : |
| A. | as high specific heat |
| B. | s a good conductor |
| C. | as high boiling point |
| D. | ow latent heat of vapourization |
| Answer» B. s a good conductor | |
| 819. |
Which one of the following has the highest value of specific heat? |
| A. | lass |
| B. | opper |
| C. | ead |
| D. | ater |
| Answer» E. | |
| 820. |
Which of the following is an example for cantilever beam? |
| A. | iving board |
| B. | ridge |
| C. | ee-saw |
| D. | ommon balance |
| Answer» C. ee-saw | |
| 821. |
The function of ball bearings in a wheel is : |
| A. | o increase friction |
| B. | o convert kinetic friction into rolling friction |
| C. | o convert static friction into kinetic friction |
| D. | ust for convenience |
| Answer» B. o convert kinetic friction into rolling friction | |
| 822. |
Which of the following is not a part of a CRT ? |
| A. | hosphor screen |
| B. | hadow mask |
| C. | lectron gun |
| D. | as plasma |
| Answer» E. | |
| 823. |
While ascending a hill, the driver of the vehicle keeps the gear ratio |
| A. | qual to 1 |
| B. | ess than 1 |
| C. | reater than 1 |
| D. | ither equal to or greater than 1 |
| Answer» E. | |
| 824. |
A single fixed pulley is used to draw water from a well because |
| A. | fficiency is 100% |
| B. | elocity ratio is low |
| C. | echanical advantage is high |
| D. | orce is applied in a convenient direction |
| Answer» E. | |
| 825. |
A wheel-barrow is an example of |
| A. | lass III lever |
| B. | ulley system |
| C. | lass I lever |
| D. | lass II lever |
| Answer» E. | |
| 826. |
A current carrying conductor is associated with |
| A. | magnetic field |
| B. | n electric field |
| C. | n electro-magnetic field |
| D. | n electrostatic field |
| Answer» D. n electrostatic field | |
| 827. |
Fleming's right hand rule is used to find the direction of the |
| A. | lternate current |
| B. | irect current |
| C. | nduced current |
| D. | ctual current |
| Answer» D. ctual current | |
| 828. |
When number of turns in a coil is trippled, without any change in the length of coil, its self inductance becomes? |
| A. | ine times |
| B. | hree times |
| C. | ix times |
| D. | ne–third |
| Answer» B. hree times | |
| 829. |
Electromagnet is constructed with which of the following ? |
| A. | teel |
| B. | oft Iron |
| C. | luminium |
| D. | ickel |
| Answer» C. luminium | |
| 830. |
Heat stored in water vapour is |
| A. | pecific heat |
| B. | atent heat |
| C. | bsolute heat |
| D. | elative heat |
| Answer» C. bsolute heat | |
| 831. |
Which of the following produces more severe burns ? |
| A. | oiling water |
| B. | ot water |
| C. | team |
| D. | elting iceberg |
| Answer» D. elting iceberg | |
| 832. |
Which of the following has got more heat capacity ? |
| A. | ron piece |
| B. | ater |
| C. | old piece |
| D. | enzene |
| Answer» C. old piece | |
| 833. |
Burns caused by steam are much severe than those caused by boiling water because |
| A. | team pierces through the pores of body quickly |
| B. | team has latent heat |
| C. | team is gas and engulfs the body quickly |
| D. | emperature of steam is higher |
| Answer» C. team is gas and engulfs the body quickly | |
| 834. |
What changes will happen to a bowl of ice and water kept at exactly zero degree Celsius ? |
| A. | ll ice will melt |
| B. | ll water will become ice |
| C. | o change will happen |
| D. | nly some ice will melt |
| Answer» D. nly some ice will melt | |
| 835. |
Shaving mirror is |
| A. | onvex |
| B. | oncave |
| C. | lane |
| D. | arabolic |
| Answer» C. lane | |
| 836. |
The type of mirrors used in the headlamp of cars is |
| A. | arabolic concave |
| B. | lane |
| C. | pherical convex |
| D. | ylindrical concave |
| Answer» B. lane | |
| 837. |
An optically plane surface reflects a beam of light |
| A. | s a parallel beam in one direction |
| B. | s diffused beams in all directions |
| C. | s parallel beams in all directions |
| D. | s a diffused beam in one direction |
| Answer» B. s diffused beams in all directions | |
| 838. |
Flemings ''Left hand Rule" is associated with the effect of |
| A. | lectric field on current |
| B. | agnetic field on magnet |
| C. | lectric field on magnet |
| D. | agnetic Field on current |
| Answer» E. | |
| 839. |
When an electric bulb breaks, there is an explosive sound. That is due to |
| A. | he chemical reaction between the gases inside the bulb |
| B. | he compressed gases inside rushing out suddenly |
| C. | he air outside rushing in to fill the vacuum inside the bulb |
| D. | one of these |
| Answer» D. one of these | |
| 840. |
Which of the following metals is used for the manufacture of heating elements provided in electric iron ? |
| A. | ickel |
| B. | hromium |
| C. | ichrome |
| D. | ungsten |
| Answer» D. ungsten | |
| 841. |
In a filament type light bulb most of the electric power consumed appears as |
| A. | isible light |
| B. | nfra-red rays |
| C. | ltra-violet rays |
| D. | luorescent light |
| Answer» C. ltra-violet rays | |
| 842. |
Tungsten is used for the manufacture of the filament of an electric bulb, because |
| A. | t is a good conductor |
| B. | t is economical |
| C. | t is malleable |
| D. | t has a very high melting point |
| Answer» E. | |
| 843. |
On the Kelvin scale, the melting point of ice is |
| A. | 73K |
| B. | 00K |
| C. | 73K |
| D. | K |
| Answer» D. K | |
| 844. |
0°K is equivalent to |
| A. | 73°C |
| B. | 273°C |
| C. | °C |
| D. | 00°C |
| Answer» C. °C | |
| 845. |
To convert temperature from Celcius to Kelvin scale, you must ________ the given temperature. |
| A. | ubtract 273 |
| B. | ultiply 273 |
| C. | dd 273 |
| D. | ivide by 273 |
| Answer» D. ivide by 273 | |
| 846. |
The temperature of a liquid is 32° F. What is its temperature in Celsius scale? |
| A. | 2° C |
| B. | ° C |
| C. | 00° C |
| D. | 12° C |
| Answer» C. 00° C | |
| 847. |
At what temperature do the Fahrenheit and Celsius scales give the same reading? |
| A. | 12 degrees |
| B. | 2 degreees |
| C. | 40 degreees |
| D. | degreees |
| Answer» D. degreees | |
| 848. |
The phenomenon which causes mirage is |
| A. | nterference |
| B. | iffraction |
| C. | olarisation |
| D. | otal internal reflection |
| Answer» E. | |
| 849. |
Convex mirrors are used as a rear view mirror in motor cycles because |
| A. | t forms real image |
| B. | t forms erect (upright) image |
| C. | t forms smaller image as compared with object |
| D. | ll of the above |
| Answer» D. ll of the above | |
| 850. |
Optical Fibre technology works on which of these principles of Physics? |
| A. | ernoulli's Principle |
| B. | ewton's law of Motion |
| C. | otal internal reflection of Light |
| D. | hotoelectric effect |
| Answer» D. hotoelectric effect | |