उत्तरों सहित नर्सिंग प्रवेश परीक्षाओं के लिए रसायन विज्ञान वर्कशीट

परमाणु का कौन-सा कण धनावेशित होता है?

1. Aइलेक्ट्रॉन
2. Bन्यूट्रॉन
3. Cप्रोटॉन
4. Dफ़ोटॉन

Which is a sign that a chemical reaction may have taken place?

1. AA gas is produced when two liquids are mixed
2. BWater freezes into ice when put in a freezer
3. CA block of wax melts when it is heated
4. DSugar dissolves completely when stirred into water

What is the melting point of a substance?

1. AThe temperature at which it dissolves in water
2. BThe temperature at which it catches fire
3. CThe temperature at which its liquid turns into a gas
4. DThe temperature at which its solid turns into a liquid

A room is at 25 °C. What is this temperature in kelvin?

1. A77 K
2. B298 K
3. C−248 K
4. D248 K

एक ही समूह के तत्वों के बारे में कौन-सा कथन सही है?

1. Aउनमें संयोजकता इलेक्ट्रॉनों की संख्या समान होती है और रासायनिक गुण मिलते-जुलते होते हैं
2. Bउनका परमाणु द्रव्यमान और प्रोटॉनों की संख्या समान होती है
3. Cउनमें इलेक्ट्रॉन कोशों की संख्या समान होती है पर गुण भिन्न होते हैं
4. Dवे हमेशा सब कमरे के तापमान पर गैस होते हैं

What is nuclear fission?

1. AThe splitting of a heavy nucleus into smaller nuclei
2. BThe joining of two light nuclei to form a heavier nucleus
3. CThe burning of uranium in oxygen
4. DThe loss of electrons from an atom

A student tests whether water temperature affects how fast sugar dissolves. Which set of factors should be kept the same in every trial?

1. ANothing, because changing several factors at once gives more useful data
2. BThe mass of sugar, the type of sugar, the volume of water and the amount of stirring
3. COnly the colour of the cup
4. DThe water temperature and the dissolving time

Frying an egg turns the clear egg white solid and white. What happens to the proteins?

1. AThey are hydrolysed, so the peptide bonds break into separate amino acids
2. BThey are converted into fats
3. CThey are denatured: their shape changes, but the peptide bonds stay intact
4. DThey are burned to carbon dioxide and water