-by Pre Empower Oct 21 : Daily Quiz for Civil Services Prelims Examination
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Welcome to Pre Empower, your daily destination for mastering multiple-choice questions (MCQs) framed for Civil Services Examinations. Each day, we present a diverse set of carefully crafted MCQs to enhance your knowledge, boost your confidence, and prepare you for success in your civil services examinations of UPSC CSE and other State PCS like APSC, BPSC, UPPCS and others.
Questions have been designed as per the demands of examination that cover a wide range of topics, including General Studies, Current Affairs, and Aptitude for CSAT. With Pre Empower, you’ll not only test your understanding but also develop critical thinking skills essential for tackling the challenges of the Preliminary exam in the best possible manner.
Join us at SMART IAS Foundation on this journey to achieve your goals and secure your future in Civil Services.
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Question 1 of 5
1. Question
The atomic number of an element is determined by the number of:
(i) Protons
(ii) Neutrons
(iii) Electrons
(iv) Nucleons
Select the correct answer:Correct
Answer: Option A
Explanation: The atomic number of an element is determined by the number of protons in its nucleus. It defines the element and distinguishes it from other elements. Neutrons and electrons do not determine the atomic number, and nucleons refer to both protons and neutrons combined.Incorrect
Answer: Option A
Explanation: The atomic number of an element is determined by the number of protons in its nucleus. It defines the element and distinguishes it from other elements. Neutrons and electrons do not determine the atomic number, and nucleons refer to both protons and neutrons combined. -
Question 2 of 5
2. Question
Which of the following metals can displace hydrogen from dilute acids?
(i) Gold
(ii) Magnesium
(iii) Copper
(iv) Zinc
Select the correct answer:Correct
Answer: Option C
Explanation: Metals like magnesium (Mg) and zinc (Zn) are more reactive than hydrogen and can displace hydrogen from dilute acids, forming a salt and releasing hydrogen gas. Gold (Au) and copper (Cu) are less reactive and cannot displace hydrogen from dilute acids.Incorrect
Answer: Option C
Explanation: Metals like magnesium (Mg) and zinc (Zn) are more reactive than hydrogen and can displace hydrogen from dilute acids, forming a salt and releasing hydrogen gas. Gold (Au) and copper (Cu) are less reactive and cannot displace hydrogen from dilute acids. -
Question 3 of 5
3. Question
Which of the following is NOT a greenhouse gas?
(i) Carbon dioxide (CO₂)
(ii) Methane (CH₄)
(iii) Oxygen (O₂)
(iv) Nitrous oxide (N₂O)
Select the correct answer:Correct
Answer: Option B
Explanation: Oxygen (O₂) is not a greenhouse gas. Greenhouse gases like carbon dioxide, methane, and nitrous oxide trap heat in the Earth’s atmosphere, contributing to the greenhouse effect. Oxygen, while essential for life, does not have the same heat-trapping properties.Incorrect
Answer: Option B
Explanation: Oxygen (O₂) is not a greenhouse gas. Greenhouse gases like carbon dioxide, methane, and nitrous oxide trap heat in the Earth’s atmosphere, contributing to the greenhouse effect. Oxygen, while essential for life, does not have the same heat-trapping properties. -
Question 4 of 5
4. Question
Which of the following reactions represents a decomposition reaction?
(i) 2H₂O → 2H₂ + O₂
(ii) Zn + H₂SO₄ → ZnSO₄ + H₂
(iii) C + O₂ → CO₂
(iv) NaOH + HCl → NaCl + H₂O
Select the correct answer:Correct
Answer: Option A
Explanation: A decomposition reaction involves the breakdown of a compound into two or more simpler substances. In (i), water (H₂O) decomposes into hydrogen (H₂) and oxygen (O₂). The other reactions are examples of displacement, combination, and neutralization reactions, respectively.Incorrect
Answer: Option A
Explanation: A decomposition reaction involves the breakdown of a compound into two or more simpler substances. In (i), water (H₂O) decomposes into hydrogen (H₂) and oxygen (O₂). The other reactions are examples of displacement, combination, and neutralization reactions, respectively. -
Question 5 of 5
5. Question
Which of the following statements is true about bases?
(i) Bases turn red litmus paper blue.
(ii) Bases react with acids to form salt and water.
(iii) Bases are proton acceptors.
(iv) Bases have a sour taste.
Select the correct answer:Correct
Answer: Option A
Explanation: Bases turn red litmus paper blue (statement i), they react with acids to form salt and water in neutralization reactions (statement ii), and they are proton acceptors, meaning they can accept H⁺ ions (statement iii). Bases generally have a bitter taste, not a sour one, making statement (iv) incorrect.Incorrect
Answer: Option A
Explanation: Bases turn red litmus paper blue (statement i), they react with acids to form salt and water in neutralization reactions (statement ii), and they are proton acceptors, meaning they can accept H⁺ ions (statement iii). Bases generally have a bitter taste, not a sour one, making statement (iv) incorrect.
