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Which of the following fibers are made of polyamides?/निम्नलिखित फ़ाइबर में से कौन से पॉली एमाईड से बना होता है? |
Decron/डेकेरान
|
Natural rubber is polymer of? प्राकृतिक रबर किसका बहुलक है? |
| A) Isoprene /आइसोप्रीन B) Styrene /स्टायरिन C) Vinyl acetate /विनायल एसीटेट D) Propene /प्रोपीन Correct Answer : Isoprene /आइसोप्रीन Explanation : Natural Rubber is a polymer of Isoprene represented as CH2=C(CH3)—CH=CH2 (2-Methyl -1, 3 – Butadiene). Natural Rubber is mainly obtained in the form of latex from rubber tree. Latex is a sticky, milky fluid that is refined in rubber ready for commercial processing. Because of its elasticity, flexibility and toughness, rubber is widly used in commercial and daily applications, for example tires, toys, vehicles, shoes, clothes, furniture, aircraft and bicycles. Thailand is the leading Rubber producing country in the world. Indonesia is the second where India is ranked fourth or fifth in Rubber production. |
Water has maximum density at which temperature? जल का सर्वाधिक घनत्व किस तापमान पर होता है: |
| A) 100oC B) 0oC C) 4oC D) 273oC Correct Answer : 4oC Explanation : When cooled to room temperature, liquid water becomes increasingly dense, just like other substances, but approximately 4 °C (39 ° F) pure water reaches its maximum density. As it is further cooled, it becomes less dense. |
Bleaching Powder is a compound of? ब्लीचिंग पाउडर का यौगिक है? |
| A) Sodium
/सोडियम
B) Calcium
/कैल्शियम
C) Magnesium
/मैग्नीशियम
D) Potassium
/पोटेशियम
Correct Answer : Calcium /कैल्शियम Explanation : Bleaching Powder (Calcium hypochlorite) is a chemical compound with formula Ca(ClO)2. the chemical formula of bleaching powder is CaOCl2 . |
Which of the following elements is used for the bleaching process? निम्न में से कौनसा तत्व ब्लीचिंग चूर्ण निर्माण मे उपयोग होता है? |
| A) Fluorine
/फ्लोरीन
B) Bromine
/ब्रोमीन
C) Chlorine
/क्लोरीन
D) Xenon
/जीनोन
Correct Answer : Chlorine /क्लोरीन Explanation : Chlorine is a pure chemical element, a green-yellow gas that easily combines with most other elements and present in many bleach compounds. |
Which of the following elements is a metal?/ निम्न में से कौनसा तत्व एक धातु है ? |
S
|
In which of the following elements is not included in structural elements:/ निम्न मे से कौनसा तत्व संरचनात्मक तत्वों में नही आता? |
Carbon/ कार्बन
|
Chlorophyll is a naturally occurring chelate compound in which central metal is:/ क्लोरोफिल एक प्राकतिक चीलेट है , इसके केंद्र मे कौनसी धातु होती है ? |
Copper/ तांबा
|
Curding of milk in the stomach is due to the action of? |
| A) Pepsin B) Renin C) HCl D) Tenin Correct Answer : Renin |
The blood coming out of lungs is richer than that entering into lungs in ? |
| A) CO2 B) O2 C) Both D) None of these Correct Answer : CO2 |
Which of the following can bring down the body temperature? |
| A) Aspirin
B) Chloroquine
C) Penicillin
D) Quinine
Correct Answer : Aspirin |
Both temporary and permanent hardness is removed on boiling water with? |
| A) Ca(OH)2
B) Na2CO3
C) CaCO3
D) CaO
Correct Answer : Na2CO3 Explanation : Sodium carbonate, Na2CO3, is also known as washing soda. It can remove temporary and permanent hardness from water. The carbonate ions from sodium carbonate react with the calcium and magnesium ions in the water to produce insoluble precipitates.The water is softened because it no longer contains dissolved calcium ions and magnesium ions. |
The general formula for an alcohol will be? |
| A) CnH2nO
B) CnH2n+1O
C) CnH2n+2O
D) CnH2nO2
Correct Answer : CnH2n+2O |
A sample of water which does not give foam with soap is known as ? पानी का एक नमूना जो साबुन के साथ झाग को नहीं देता , कहा जाता है? |
| A) Saline water
B) Heavy water
C) Hard water
D) Distilled water
Correct Answer : Hard water |
The highest and the lowest value range of PH scale are? पीएच के उच्चतम और निम्न मूल्य हैं? |
| A) 14,0
B) 7,1
C) 14, -1
D) 14, -14
Correct Answer : 14,0 Explanation : pH (potential of hydrogen) is a numeric scale used to specify the acidity or basicity. Usually the range of a pH scale is 0−14 . Strongest acid has pH of 1 while strongest base has pH of 14. (0 - 6.99 are acids. 7 is neutral. 7.1 - 14 are bases.) |
What is the permissible range of pH for drinking water as per the Indian standards? भारतीय मानक के अनुसार पीने के पानी के लिए पीएच की स्वीकार्य सीमा क्या है? |
| A) 6 to 9
B) 6.5 to 7.5
C) 6 to 8.5
D) 6.5 to 8.5
Correct Answer : 6.5 to 7.5 |