उत्तरों सहित नर्सिंग प्रवेश परीक्षाओं के लिए रसायन विज्ञान वर्कशीट

What does the prefix "milli-" mean?

1. AOne-thousandth (10⁻³)
2. BOne-millionth (10⁻⁶)
3. COne thousand (10³)
4. DOne-hundredth (10⁻²)

What does the double arrow (⇌) in a chemical equation show?

1. AThe reaction needs a catalyst
2. BThe reaction is reversible
3. CThe reaction releases heat
4. DThe reaction is very fast

Which element makes up the largest share of the human body by mass?

1. ACarbon
2. BOxygen
3. CNitrogen
4. DHydrogen

How many lone (non-bonding) pairs of electrons are on the oxygen atom in a water molecule?

1. A1
2. B4
3. C2
4. D0

Why does the vapour pressure of a liquid increase as it is heated?

1. AThe attractions between the molecules become stronger
2. BThe liquid's volume decreases and squeezes out vapour
3. CMore molecules have enough energy to escape into the gas phase
4. DThe molecules become heavier and press harder on the surface

To which family of organic compounds does ethanol, C₂H₅OH, belong?

1. ACarboxylic acids
2. BEsters
3. CAlkanes
4. DAlcohols

Haemoglobin binds oxygen reversibly: Hb + O₂ ⇌ HbO₂. How does this equilibrium help deliver oxygen to tissues?

1. ALow O₂ in tissues shifts it to the right, releasing oxygen
2. BHigh O₂ in tissues shifts it to the left, absorbing oxygen
3. CThe equilibrium does not change anywhere in the body
4. DLow O₂ in tissues shifts it to the left, releasing oxygen

बर्फ़ीली सड़क पर नमक छिड़कने से बर्फ़ पिघलने में मदद क्यों मिलती है?

1. Aनमक बर्फ़ को सघन बना देता है जिससे वह सड़क में धँस जाती है
2. Bघुला हुआ नमक पानी का हिमांक घटा देता है
3. Cनमक पानी का हिमांक बढ़ा देता है
4. Dनमक बर्फ़ से अभिक्रिया करके बहुत ऊष्मा मुक्त करता है