Prelims MCQs Quiz 18 : Science


1. Bluetooth and Wi-Fi are two standards for wireless communication. With respect to the difference between the two, which of the following is/are correct?
1. Bluetooth is more secure than Wi-Fi.
2. While Bluetooth works at 2.45 GHz Wi-Fi works at 1.8 GHz.
3. Bluetooth consumes less power than Wi-Fi.
Select the correct answer using the codes given below.
a) 1 and 2 only
b) 1 and 3 only
c) 2 and 3 only
d) 3 only

Answer & Explanation

2. With reference to induced pluripotent stem cells (iPSCs), consider the following statements :
1. They are originally embryonic stem cells.
2. Tissues derived from iPSCs can avoid rejection by the immune system.
Which of the statements given above is/are correct?
a) 1 only
b) 2 only
c) Both 1 and 2
d) Neither 1 nor 2

Answer & Explanation

3. Water disinfectants used to kill or deactivate pathogenic microorganisms. Which among the following can be used as a disinfectant?
1. Chlorine
2. Hydrogen peroxide
3. Ultraviolet rays
Select the correct answer using the codes given below.
a) 1 and 2 only
b) 1 and 3 only
c) 2 and 3 only
d) 1, 2 and 3

Answer & Explanation

4. Consider the following statements about additive manufacturing:
1. In this, an object is created by laying down successive layers of material until the entire object is created.
2. It can be used in reconstructing heavily damaged evidence acquired from crime scene investigations.
Which of the statements given above is/are correct ?
a) 1 only
b) 2 only
c) Both 1 and 2
d) Neither 1 nor 2

Answer & Explanation

5. Kessler syndrome is
a) a disease in which the number of chromosomes in human body increases.
b) is a condition in which there is hypersecrition of insulin.
c) collisional cascading effect in low earth orbits.
d) a rare eye condition in which eye balls move involuntarily.

Answer & Explanation

6. Touchscreen mobile phones have become common these days. In this respect, which of the following is/are correct?
1. Resistive touchscreen are quick to respond compared to a capacitive touchscreen.
2. Resistive touchscreen are expensive compared to a capacitive touchscreen.
3. Resistive touchscreen allow for multi-touch gestures such as pinch to zoom.
Select the correct answer using the codes given below.
a) 1 and 2 only
b) 2 only
c) 2 and 3 only
d) None

Answer & Explanation

7. Reusing cooking oil is unhealthy because
a) bacteria feeds on food particles left in the oil and can cause food poisoning.
b) reused oil contains free radicals that can damage cells and lead to increased cancer risk
c) both (a) and (b)
d) None of the above

Answer & Explanation

8. Recently, a term “WhatsAppititis” was making news. It is :
a) an eye strain caused by repetitive and continuous use of whatapp or any instant messaging service
b) a repetitive finger strain injury caused by over use of instant messaging services
c) both (a) and (b)
d) None of the above

Answer & Explanation

9. Aluminium has been used in aircrafts because it offers many advantages. These are
1. excellent machinability and plasticity which helps in bending, cutting, and drawing aluminium sheets.
2. high thermal resistance making it suitable for use in engines which are exposed to extreme heat.
3. ability to withstand the stresses that occur during launch and operation in space.
Select the correct answer using the codes given below.
a) 1 and 2 only
b) 1 and 3 only
c) 2 and 3 only
d) 1, 2 and 3

Answer & Explanation

10. Catching ‘red handed’ is based on the so called Phenolphthalein Test. The principle behind this is that when phenolphthalein is mixed with :
a) acidic solution it turns pink
b) basic solution it turns pink
c) water it turns pink
d) none of the above

Answer & Explanation

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Please read these important articles about prelims preparation

1. How UPSC asks current affairs in GS Prelims

2. How to practice prelims MCQs for UPSC

3. Applying logic in UPSC General Studies Prelims

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