उत्तरों सहित नर्सिंग प्रवेश परीक्षाओं के लिए रसायन विज्ञान वर्कशीट

A blown-up balloon is put in a freezer. What happens to its volume?

1. AIt increases
2. BIt decreases
3. CIt stays exactly the same
4. DThe balloon bursts

A cleaning solution has a pH of 12. How is it described?

1. AStrongly acidic
2. BNeutral
3. CStrongly basic
4. DWeakly acidic

What is plasma, as a state of matter?

1. AA solid that conducts electricity
2. BThe liquid part of blood
3. CA liquid that has been cooled below its freezing point
4. DA very hot gas in which atoms have lost electrons and become ions

कौन-सा कथन प्रबल अम्ल का वर्णन करता है?

1. Aवह पानी में पूर्णतः आयनित हो जाता है
2. Bवह हमेशा अत्यधिक सांद्र होता है
3. Cउसका pH 7 से अधिक होता है
4. Dवह हाइड्रोजन आयनों को केवल आंशिक रूप से छोड़ता है

Why does water boil at a lower temperature at the top of a high mountain?

1. AThe air pressure is lower, so less vapour pressure is needed to boil
2. BGravity is weaker, so the molecules escape more easily
3. CThe air is colder, so the water loses heat and boils sooner
4. DThere is less oxygen dissolved in the water up there

Radioactive iodine (iodine-131) is used to treat some thyroid conditions. Why does it reach the thyroid?

1. AIodine-131 is not radioactive inside the body
2. BIodine is strongly attracted to the metal ions stored in the neck
3. CThe thyroid gland takes up iodine to make its hormones
4. DRadiation is always drawn toward the head

Many ethene (C₂H₄) molecules join together to form poly(ethene), a plastic. What type of reaction is this?

1. AAddition polymerisation, in which the C=C double bonds open up to link the monomers
2. BCombustion, in which ethene reacts with oxygen
3. CCondensation polymerisation, in which a water molecule is released at each new link
4. DHydrolysis, in which water breaks each monomer apart

A solution of acetic acid conducts electricity only weakly, while hydrochloric acid of the same concentration conducts strongly. Why?

1. AAcetic acid does not dissolve in water at all
2. BAcetic acid only partly ionises, so it forms fewer ions
3. CAcetic acid forms more ions than hydrochloric acid does
4. DHydrochloric acid contains metal atoms