Chemistry Quiz For SSC CGL Exam 2019-20 : 28th December

Q1. किसी विमान के टायर को फुलाने के लिए इस्तेमाल की जाने वाली गैस है-
(a) हाइड्रोजन
(b) नाइट्रोजन
(c) हीलियम
(d) नियॉन

Q2. इनमें से किस में कार्बन होता है?
(a) लिग्नाइट
(b) टिन
(c) सिल्वर
(d) आयरन

Q3. शुद्ध सोना कितने कैरेट का होता है?
(a) 22
(b) 24
(c) 28
(d) 20

Q4. ओकटाइन संख्या किसकी गुणवत्ता का मापक है?
(a) खाद्य तेल
(b) पेट्रोल
(c) मिट्टी का तेल
(d) सुगंधित तेल

Q5. टेबल नमक (NaCL) का एक उत्पाद है-
(a) कमजोर एसिड और कमजोर क्षार
(b) मजबूत अम्ल और मजबूत क्षार
(c) कमजोर अम्ल और मजबूत क्षार
(d) मजबूत अम्ल और कमजोर मूल

Q6. गहरे समुद्र में गोताखोरों द्वारा श्वसन के लिए ऑक्सीजन के साथ किस गैस को मिश्रित किया जाता है?
(a) हीलियम
(b) नाइट्रोजन
(c) क्सीनन
(d) अमोनिया

Q7. भारी जल का रासायनिक सूत्र है?
(a) H_2 O
(b) D_2 O
(c) H_2 CO_3
(d) H_2 S

Q8. परमाणु नाभिक की खोज किसने की थी:
(a) रदरफोर्ड
(b) डाल्टन
(c) आइंस्टीन
(d) थॉम्पसन

Q9. निम्नलिखित में से कौन सा मिश्रण सजातीय है?
(a) स्टार्च और चीनी
(b) मेथनॉल और पानी
(c) ग्रेफाइट और चारकोल
(d) कैल्शियम कार्बोनेट और कैल्शियम बाइकार्बोनेट

Q10. प्राकृतिक रबर का पॉलिमर है-
(a) एथिलीन
(b) आइसोप्रिन
(c) एसिटिलीन
(d) हेक्सेन

Solutions:

S1. Ans.(b)
Sol. Nitrogen gas is used in the tyres of an aeroplane. This is because the nitrogen gas does not support combustion and can assist in preventing wheel fire when the aircraft lands .
S2. Ans.(a)
Sol. Coal minerals are divided mainly into four types on the basis of the percentage of Carbon amount-
Peat, Lignite, Bituminous and Anthracite.

S3. Ans.(b)
Sol. It is an extension of the older carat (Karat in North American spelling) system of denoting the purity of gold by fractions of 24, such as ’18 carat’ for an alloy with 75% (18 parts per 24) pure gold by mass.

S4. Ans.(b)
Sol. The Octane number of a fuel is the measure of its antiknock quality when it is used in a spark ignition, internal combustion engine as compared to the antiknock quality of ISO-octane. The higher octane number of a fuel means the better antiknocking capacity for that fuel.

S5. Ans.(b)
Sol. The compounds formed after reaction between the strong base and strong acid are known as neutral salt. Sodium chloride (NaCI) is an example of neutral which is salt also known as Table Salt.

S6. Ans.(a)
Sol. Heliox is a breathing gas composed of a mixture of Helium (He) and Oxygen (O2). This is frequently used for respiration by divers in the deep sea.

S7. Ans.(b)
Sol. Heavy water (D2 O) Deuterium Oxide is used as a moderator and coolant in nuclear reactors because it slows down neutrons effectively and also has a low probability of absorption of neutrons.

S8. Ans.(a)
Sol. The nucleus is a very dense region consisting of protons and neutrons at the centre of an atom. It was discovered in 1911 as a result of Ernest Rutherford’s interpretation of the 1909 Geiger-Marsden gold foil experiment.

S9. Ans.(b)
Sol. A mixture of methanol (a liquid) and water (a liquid) is homogeneous.

S10. Ans.(b)
Sol. Polymerization is the process of joining together a large number of small molecules to make a number of the very large molecule. Natural rubber is the natural polymer of Isoprene.

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