General Science

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Optical fiber works on the principle of? / ऑप्टिकल फाइबर किस के सिद्धांत के आधार पर काम करती है ?

Refraction of light/ प्रकाश का अपवर्तन
Reflection of light/ प्रकाश का परावर्तन
Total internal reflection of light/ प्रकाश का पूर्ण आंतरिक परावर्तन
Prism / प्रिज्म

Correct Answer :Total internal reflection of light/ प्रकाश का पूर्ण आंतरिक परावर्तन

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What is the formula of Potash Alum?

A)
KAI(SO4)2

B)
KAI(H2O)2

C)
KAISO4

D)
None of these.


Correct Answer :

KAI(SO4)2


Explanation :

Potassium alum, potash alum, or potassium aluminium sulfate is a chemical compound: the double sulfate of potassium and aluminium, with chemical formula KAl(SO₄)₂.

It is commonly encountered as the dodecahydrate, KAl(SO₄)₂·12H₂O.

The fresh milk turns sour, what will be its pH , if it was 6 previously?/ताजा दूध के खट्टा होने पर, उसका पीएच क्या होगा, यदि पहले उसका पीएच 6 था ?

Less than 6/ 6 से कम
More than 6/ 6 से अिधक
Neutral (pH=7)/ तटस्थ ( (पीएच = 7)
No change in pH/ पीएच मे कोई परिवर्तन नहीं

Correct Answer :Less than 6/ 6 से कम

Which gas is the supporter of combustion?/ कौन सी गैस ज्वलन का समर्थक करती है?

Carbon dioxide/ कार्बन डाइऑक्साइड 
Chloride/ क्लोराइड
Methane/ मीथेन
None of these/ इनमे से कोई भी नहीं

Correct Answer :Methane/ मीथेन
 

The mass number of nucleus is:

A)
Always less than its atomic number

B)
The sum of the number of protons and neutrons present in the nucleus

C)
Always more than the atomic weight

D)
A fraction


Correct Answer :

The sum of the number of protons and neutrons present in the nucleus


Explanation :

The mass of nucleus of an atom is equal to its atomic mass=No. Of Protons + No. Of Neutrons

The mass of electrons is almost negligible, so the atomic mass doesn't show a major change on addition or removing of mass of electron.

Note:Nucleus of Hydrogen atom consists of just one proton, thus its Mass No. is 1 unit.

In the night vision apparatus which type of waves are used? / रात दृष्टि तंत्र मे किस प्रकार की तरंगों का इस्तेमाल होता है?

Ultraviolet rays/ पराबैंगनी किरणों
Infrared rays/ इन्फ्रारेड किरणों
X‐ rays/ एक्स-रे
Beta rays/ बीटा किरणों

Correct Answer :Infrared rays/ इन्फ्रारेड किरणों

A particle is moving freely. Then its?/ एक कण स्वतंत्र रूप से घूम रहा है। तब उसकी?

Kinetic energy is equal to potential energy./ गतिज ऊर्जा स्थितिज ऊर्जा के समान होती है।
Kinetic energy is less than zero./ गतिज ऊर्जा शून्य से कम होती है।
Kinetic energy is greater than zero./ गतिज ऊर्जा शून्य से अधिक होती है।
Kinetic energy is zero./ गतिज ऊर्जा शून्य होती है।

Correct Answer :Kinetic energy is greater than zero./ गतिज ऊर्जा शून्य से अधिक होती है।

Which are not fat soluble vitamins? / इनमे से कौन सा विटामिन वसा मे घुलनशील नहीं है?

A/ ए
D/ डी
K/ के
B/ बी

Correct Answer :B/ बी

Life span of red blood cells is?/ लाल रक्त कोशिकाओं का जीवनकाल कितना होता है?

90-100 days
100-120 days
70-90 days
120-180 days

Correct Answer :100-120 days

Small pieces of solid matter which are found scattered in the interplanetary space of the solar system are known as: / सौर प्रणाली के अंतर-ग्रहीय में इधर उधर फैले हुए ठोस पदार्थ के छोटे टुकड़े इनमें से किस नाम से जाने जाते हैं:

Asteroids/ क्षुद्रग्रहों
Meteoroids/ उल्कापिंड
Comet/ धूमकेतू
Satellites/ उपग्रह

Correct Answer :Meteoroids/ उल्कापिंड
 

Water is used to cool the engines of cars, buses, trucks, etc. It is because water has? / पानी का प्रयोग कारों, बसों, ट्रकों के इंजन को ठंडा करने के लिए प्रयोग किया जाता है ऐसा इसलिए किया जाता है क्योंकि पानी का

Low specific heat/ निम्न विशिष्टताप होता है
High specific heat/ उच्च विशिष्ट ताप होता है
Low viscosity/ निम्न श्यानता होती है
High viscosity/ उच्च श्यानता होती है

Correct Answer :High specific heat/ उच्च विशिष्ट ताप होता है

Which instrument is used to measure speed of the vehicle? / वाहन की गति की माप करने के लिए किस उपकरण का प्रयोग किया जाता है?

Stroboscope
Streoscope
Speedometer
Tachometre

Correct Answer :Speedometer/स्पीडोमीटर

What is the chemical name of vitamin B1?

A)

Retionol


B)

Riboflavin


C)

Thiamine


D)

Ascorbic acid



Correct Answer :

Thiamine


Explanation :

Thiamine, also known as thiamin and vitamin B1, is a vitamin, an essential micronutrient.
Vitamin B1 is a water-soluble and found naturally in some foods. Food sources of thiamine include whole grains, legumes, and some meats and fish.
It plays a vital role in the growth and function of various cells.

Which of the following below are the Alloys of solder? / निम्नलिखित में क्या सोल्डर का मिश्र धातु है?

Tin and lead/ टिन तथा लैड
Iron and nickel/ लौह और निकल
Copper and zinc/ कॉपर और जिंक 
Copper and tin/ कॉपर और टिन

Correct Answer :Tin and lead/ टिन तथा लैड

To manufacture vanaspati from vegetable oil which gas is used?

Hydrogen
Oxygen
Nitrogen
Carbon dioxide

Correct Answer :Hydrogen

Which is the best food source for sodium?/ सोडियम के लिए सबसे अच्छा भोजन स्रोत क्या है?

Salt/ नमक
Cereals/ अनाज
Pulses/ दलहन
Vegetables/ सब्जियां 

Correct Answer :Salt / नमक

An apparatus used for charging air with petrol vapours in an internal combustion engine is called?

Carburettor
Callipers
Chronomete
Electrometer


Correct Answer :Carburettor

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