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Science Quiz for SSC,Railway,NDA,CDS

Q1. Azadirachata indica is the scientific name of –
एजादिराचेटा इंडिका किसका वैज्ञानिक नाम है-
(a) Neem/ नीम
(b) Teak/ सागौन
(c) Silver Oak/ सिल्वर ओक
(d) Tulsi
Ans.(a)
Sol. Azadirachta indica, commonly known as neem, nimtree or Indian lilac, is a tree in the mahogany family Meliaceae.

Q2. Octopus belongs to the phylum –
ऑक्टोपस, किस फाईलम के अंतर्गत आता है:
(a) Mollusca /मोलुस्का
(b) Cnidaria/निडारिया
(c) Echinodermata /एकीनोडरमाटा
(d) Chordata/कोर्डेटा

Ans.(a)
Sol. Octopus belongs to the phylum Mollusca.

Q3. Medulla oblongata is a part of which of the following?
मेडुला ओब्लोन्गाटा निम्नलिखित में से किसके का एक हिस्सा है?
(a) Heart /दिल
(b) Brain /मस्तिष्क
(c) Lungs /फेफड़े
(d) Stomach /पेट

Ans.(b)
Sol. The medulla oblongata helps regulate breathing, heart and blood vessel function, digestion, sneezing, and swallowing. This part of the brain is a center for respiration and circulation.

Q4.Photosynthesis in plants takes place in –
पौधों में प्रकाश संश्लेषण किस भाग में होता है –
(a) Stem / तना
(b) Leaves/ पत्तियां
(c) Roots / जड़ें
(d) Flower / फूल

Ans.(b)
Sol. Photosynthesis is the process by which leaves absorb light and carbon dioxide to produce carbohydrate (food) for plants to grow. The sunlight can get to the chloroplasts in the cells.

Q5. Which drug is used to cure Hypertension? 
उच्च रक्तचाप का इलाज करने के लिए किस दवा का उपयोग किया जाता है?
(a) Risedronate / रेज़ेरेनेट
(b) Diazepam / डायजेपाम
(c) Folic Acid / फोलिक एसिड
(d) Hydralazine / हीड्रालाज़ि

Ans.(d)
Sol. Hydralazine is used to cure high blood pressure (hypertension).

Q6. Which is used as laughing gas is- 
हास्य गैस (लाफिंग गैस) के रूप में उपयोग की जाने वाली गैस है-
(a) Nitrous Oxide / नाईट्रस ऑक्साइड
(b) Nitrogen dioxide / नाइट्रोजन डाइऑक्साइड
(c) Nitrogen Trioxide / नाइट्रोजन ट्रायऑक्साइड
(d) Nitrogen Tetra Oxide / नाइट्रोजन टेट्राऑक्साइड

Ans. (a)
Sol.Nitrous Oxide (N2O) is also known as laughing gas. It is a colourless gas with a sweet odour and taste. It is also used as the anesthetic gas.

Q7. What is Nila thotha?
नीला थोथा क्या है ?
(a) Copper Sulphate / कॉपर सल्फेट
(b) Calcium Sulphate / कैल्शियम सल्फेट
(c) Iron Sulphate / आयरन सल्फेट
(d) Sodium Sulphate / सोडियम सल्फेट

Ans. (a)
Sol.Nila thotha is a compound of Copper and sulphate. Its chemical formula is CuSO4.5H2O.

Q8. Which is the fundamental element of all organic compounds?
सभी कार्बनिक यौगिकों का मूल तत्व क्या है?
(a) Nitrogen /नाइट्रोजन
(b) Oxygen /ऑक्सीजन
(c) Carbon / कार्बन
(d) Brimstone/ गंधक

Ans. (c)
Sol.The organic compounds are a large class of chemical compounds in which one or more atoms of carbon are covalently linked atoms of other elements, most commonly Hydrogen, Oxygen or Nitrogen.

Q9. Which acid is found in Vinegar?
सिरके में कौन सा एसिड पाया जाता है?
(a) Lactic Acid /लैक्टिक एसिड
(b) Citric Acid /साइट्रिक एसिड
(c) Malic Acid/मलिक एसिड
(d) Acetic Acid /एसिटिक एसिड

Ans. (d)
Sol. Acetic acid is the chief component of vinegar. Vinegar is liquid consisting mainly of acetic acid (CH3COOH) and water.

Q10. To avoid ‘knocking’ of the engine of a car, which one of the following is used as an anti-knocking agent?
एक कार के इंजन को ‘नॉकिंग’ से बचने के लिए, इनमें से क्या एंटी-नॉकिंग एजेंट के रूप में उपयोग किया जाता है?
(a) Ethyl alcohol / एथिल अल्कोहल
(b) Butane/ब्युटेन
(c) Lead Tetra Ethyl / लेड टेट्रा एथिल
(d) White Petrol /वाइट पेट्रोल

Ans. (c)
Sol. Tetraethyl Lead (CH3CH2)4Pb is the chief antiknock agent for automotive gasoline or petrol.

Q11. If a ball is thrown up, which of the following does not change?
यदि एक गेंद को ऊपर फेंका जाता है, तो निम्न में से क्या नहीं बदलता है?
(a) Acceleration due to gravity/ गुरुत्वाकर्षण के कारण त्वरण
(b) Speed/ गति
(c) Potential energy/ स्थितिज ऊर्जा
(d) Distance/दूरी

Ans.(a)
Sol. When a ball is thrown upwards the acceleration due to gravity remains constant throughout. It comes to rest for a moment at the highest point of motion just before returning back to earth.

Q12. The SI unit of intensity of sound is ______.
ध्वनि की तीव्रता की SI इकाई क्या है?
(a) Watt per square meter/ वाट प्रति वर्ग मीटर
(b) joule per square meter/ जूल प्रति वर्ग मीटर
(c) newton per square meter/ न्यूटन प्रति वर्ग मीटर
(d) tesla per square meter/ टेस्ला प्रति वर्ग मीटर

Ans.(a)
Sol. The SI unit of intensity, which includes sound intensity, is the watt per square meter (W/m2).

Q13. To keep drinks at the same temperature for quite sometime, the walls of thermos bottle are coated with: 
पेय को थोड़े समय के लिए समान तापमान पर रखने के लिए, थर्मस बोतल की दीवारों की सतह को किससे लेपित किया जाता हैं:
(a) Aluminium paint/एल्यूमिनियम पेंट
(b) Lead Powder/लेड पाउडर
(c) Silver layer/सिल्वर परत
(d) Mercury Layer/मरकरी परत

Ans.(c)
Sol. The glass or steel which is used in thermos bottle is coated with a silver layer to keep drinks at the same temperature for some time.

Q14. The atmosphere exerts enormous pressure on us. But, we do not feel it because 
वातावरण हम पर भारी दबाव डालता है। लेकिन, हम यह महसूस नहीं होता हैं क्योंकि-
(a) Our blood exerts a pressure slightly more than that of the atmosphere/ हमारा रक्त वायुमंडल की तुलना में थोड़ा अधिक दबाव डालता है
(b) We are used to it/ हम इसके अभ्यस्त हैं
(c) Our bones are very strong and can withstand the pressure/ हमारी हड्डियां बहुत मजबूत हैं और दबाव का सामना कर सकती हैं
(d) The surface are of our head is very small/ हमारे सिर का सतह क्षेत्र बहुत कम है

Ans.(a)
Sol. The atmosphere exerts enormous pressure on us but we do not feel it, because our blood exerts pressure slightly more than that of the atmosphere. We feel this pressure in water because the pressure underwater is greater than our normal blood pressure.

Q15. The sensation of weightlessness in a spacecraft in an orbit is due to the –
एक कक्ष में एक अंतरिक्ष यान में वजनहीनता की अनुभूति _______ के कारण होती है –
(a) Absence of gravity outside /बाहर गुरुत्वाकर्षण की अनुपस्थिति
(b) Acceleration in the orbit which is equal to the acceleration due to gravity outside /बाहर गुरुत्वाकर्षण की अनुपस्थिति
(c) Presence of gravity outside but not inside the spacecraft /बाहर गुरुत्वाकर्षण की उपस्थिति होती है लेकिन अंतरिक्ष यान के अंदर नहीं होती है
(d) Fact that spacecraft in the orbit has no energy /कक्षा में अंतरिक्ष यान की कोई ऊर्जा नहीं है

Ans.(b)
Sol. The sensation of weightlessness in a spacecraft in an orbit is due to the acceleration in the orbit which is equal to the acceleration due to gravity outside.

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