Physics - General Knowledge Questions and Answers

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By measuring the Hall voltage in a metal or semiconductor one can find in it?/ किसी धातु या अर्धचालक में हाल विभव के मापन से निम्न ज्ञात होता है?

Sign of charge carriers/ आवेशों का चिन्ह
State of charge carriers/ आवेशों की अवस्था
Concentration of the charge carriers. / आवेशों  का घनत्व
None of these. / इनमे से कोई नहीं


Correct Answer :Sign of charge carriers/ आवेशों का चिन्ह

The release of energy during nuclear fission or disintegration energy of one gram of uranium is?/ नाभिकीय विखंडन में उत्सर्जित ऊर्जा या एक ग्राम यूरेनियम के नाभिकीय विखंडन  में उत्सर्जित ऊर्जा  होती है?

2.28 x 10kWh
2.18 x 104 kWh.
2.08 x 104 kWh.
None of these. / इनमे से कोई नहीं


Correct Answer :2.28 x 10kWh

The small atomic nuclei are combined together to form a single heavy and larger nucleus whose mass is less than the initial masses of nuclei and the difference in mass is transformed into The energy then this process of nuclear combination is called as?/ छोटे परमाणु नाभिक परल्पर संयुक्त होकर एक भारी नाभिक निर्मित करते है जिसका द्रव्यमान प्रारंभिक नाभिको के द्रव्यमान से कम होता है तथा द्रव्यमान अंतर ऊर्जा में रूपांतरित हो जाती है तो नाभिकीय संयोजन की इस प्रक्रिया को कहते है?

Fusion / संयोजन
Fission / विखंडन
Chain reaction / श्रंखला प्रतिक्रिया
None of these. / इनमे से कोई नहीं


Correct Answer :Fusion / संयोजन

The focal length of a concave lens is always______./ एक अवतल लेंस के फोकल दूरी हमेशा
______ होती है ।

Always negative/ नकारात्मक
Always positive/ सकारात्मक
Either positive or negative/ या तो सकारात्मक या नकारात्मक
Neither positive nor negative/ न नकारात्मक ना ही धनात्मक


Correct Answer :Always negative/ नकारात्मक

Defect of colour blindness can be remedied by the use of:/ वर्णाधता को किस उपाय से ठीक किया
जा सकता है ?

Concave lens/ अवतल लेंस
Convex lens/ उत्तल लेंस
Cylindrical lens/ बेलनाकार लेंस
None of the above/ इनमे से कोई नहीं


Correct Answer :None of the above/ इनमे से कोई नहीं

When a gas is turned into a liquid, the process is called:/ जब गैस, तरल मे परिविर्तत होता है , उस
प्रक्रिया को क्या कहते है ?

Condensation/ संघनन
Evaporation/ वाष्पीकरण
Deposition/ निक्षेपण
Sublimation/ ऊर्ध्वपातन


Correct Answer :Condensation/ संघनन

Ozone shield protects us from?

A) Cosmic rays
B) UV–C
C) UV–B
D) Both II and III

Correct Answer : Both II and III

The resistance of a conductor is reduced to half its initial value. ln doing so the heating effects in the conductor will become ?

A) Half
B) One fourth
C) Four times
D) Double

Correct Answer : Double

An electric iron is based upon the principle of?

A) Magnetic effect of current
B) Heating effect of current
C) Chemical effect of current
D) None of these

Correct Answer : Heating effect of current
Explanation :

When electric current is passed through a conductor, it generates heat due to the resistance it offers to the current flow. This effect is called as heating effect of electric current and it is effectively utilized in heater, electric iron, electric toaster, etc

A.C. used in India's domestic consumption has a frequency ?

A)
60 Hz

B)
50 Hz

C)
30 Hz

D)
100 Hz


Correct Answer :

50 Hz


Explanation :

The most of countries uses a frequency of 50Hz and a voltage of 220-240(higher voltages for better efficiency in transmission). The exception, where 60Hz is used (with a voltage of 110-120), is the Americas (North and South) and the Caribbean (and parts of Japan and Korea).

The image formed by a concave mirror is observed to be virtual, erect and larger than the object. then the position of the object should be ?

A) Between the focus and the center of curvature
B) At the center of curvature
C) Beyond the center of curvature
D) Between the pole of the mirror and the focus

Correct Answer : Between the pole of the mirror and the focus

Which of the following colour has the least wavelength?

A) Red
B) Orange
C) Violet
D) Blue

Correct Answer : Violet
Explanation :

The colours of the spectrum of white light are violet, indigo, blue, green, yellow, orange and red (VIBGYOR). The Red light has longer wavelengths and the violet has shortest wavelength.

Convex lens of suitable focal length can correct ?

A) short sightedness
B) long sightedness
C) presbyopia
D) astigmatis

Correct Answer : long sightedness
Explanation :

The colours of the spectrum of white light are violet, indigo, blue, green, yellow, orange and red (VIBGYOR). The Red light has longer wavelengths and the violet has shortest wavelength.

The frequency of alternating current supplied in India is?

A)
50 Hz

B)
60 Hz

C)
100 Hz

D)
220 Hz


Correct Answer :

50 Hz


Explanation :

The most of countries uses a frequency of 50Hz and a voltage of 220-240(higher voltages for better efficiency in transmission). The exception, where 60Hz is used (with a voltage of 110-120), is the Americas (North and South) and the Caribbean (and parts of Japan and Korea).

Four resistances of 4 ohms are connected in parallel. The resultant resistance will be ?

A)
4 ohms

B)
3 ohms

C)
2 ohms

D)
1 ohm


Correct Answer :

1 ohm


Explanation :

suppose the resultant resistance=R

For parallel combination of resistances, then resultant resistance 1/R=1/4+1/4+1/4+1/4
(Since for parallel combination  1/R=1/R1+1/R2+....)
1/R=4/4
R=1 Ohm

Dynamo works on the principle of ?

A)
Electrolysis

B)
Thermal Radiation

C)
Electromagnetic Induction

D)
None of these


Correct Answer :

Electromagnetic Induction

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