उत्तरों सहित नर्सिंग प्रवेश परीक्षाओं के लिए रसायन विज्ञान वर्कशीट

What is radioactivity?

1. AThe release of radiation by unstable atomic nuclei
2. BThe release of heat and light when fuels burn in air
3. CThe glow produced by any hot object
4. DThe flow of electrons through a metal wire

What is an element?

1. AA physical mixture of different substances
2. BA substance made of only one kind of atom
3. CA substance of two or more elements chemically bonded together
4. DA particle with an electric charge

About what percentage of dry air is oxygen?

1. A78%
2. B1%
3. C50%
4. D21%

Water has a high specific heat capacity. How does this help the human body?

1. AIt makes water a poor solvent for salts
2. BIt makes the blood more acidic
3. CIt allows oxygen to dissolve in water more easily
4. DIt helps keep body temperature stable

What is the conjugate base of nitric acid, HNO₃?

1. AHNO₂
2. BNO₃⁻
3. CH₂NO₃⁺
4. DNO₂⁻

Why does oxygen move from the alveoli of the lungs into the blood?

1. AOxygen is pumped actively into the blood
2. BThe partial pressure of oxygen is higher in the alveoli than in the blood
3. CThe partial pressure of oxygen is higher in the blood than in the alveoli
4. DOxygen is heavier than carbon dioxide

Which list puts 0.1 M solutions of HCl, acetic acid (CH₃COOH) and NaCl in order of increasing pH?

1. AHCl < NaCl < CH₃COOH
2. BNaCl < CH₃COOH < HCl
3. CHCl < CH₃COOH < NaCl
4. DCH₃COOH < HCl < NaCl

100 mL of 1 M NaCl is mixed with 100 mL of 3 M NaCl. What is the concentration of the mixture?

1. A1.5 M
2. B4 M
3. C3 M
4. D2 M