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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
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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 104 kWh
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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
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The focal length of a concave lens is always______./ एक अवतल लेंस के फोकल दूरी हमेशा |
Always negative/ नकारात्मक
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Defect of colour blindness can be remedied by the use of:/ वर्णाधता को किस उपाय से ठीक किया |
Concave lens/ अवतल लेंस
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When a gas is turned into a liquid, the process is called:/ जब गैस, तरल मे परिविर्तत होता है , उस |
Condensation/ संघनन
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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 |
Dynamo works on the principle of ? |
| A) Electrolysis
B) Thermal Radiation
C) Electromagnetic Induction
D) None of these
Correct Answer : Electromagnetic Induction |