In this page we have created 25 no. of questions on Science GK which can be handy the exam you are preparing for. 

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10:00

1. Which of the following statement is correct?





Rheostat is a device with variable resistance of unknown value. It is used to change the resistance of a circuit.

Iron is a metal and so it is a good conductor of electricity. All metals are good conductor of electricity.

1HP = 746 Watt.

2. which of the following phenomena is responsible for round shape of soap bubble?





Any liquid drop shapes round. It is due to the phenomena of surface tension. For the same reason the raindrops become spherical.

3. What the term p stands for in the pH scale ?





Potenz is a German word which means power. The value of pH determines the acidity and basecity of a compound. The value of pH ranges from 0 to 14. If the pH value is greater the compound is less acidic and more basic.

4. in which phase of cell division does the replication of DNA take place ?





Correct Answer: Interphase.

Interphase is the preparetory phase of mitosis cell division. It may further be divided into three phase viz. G1 phase, S phase and G2 phase. Actually, DNA replication occurs in S phase of InterphaseIn prophase nucleoi and nuclear envelope disappears. Kinetochore (a disk like structure) holds two identical sister chromatids at centromere.

5. Which of the following phenomena shows that the universe is accelerating at a rapid speed?





Red shift is not a phenomena, it is an observation. Doppler shift / Doppler Effect shows that the universe is in a state of rapid and accelerated rate of expansion.

6. Which of the following laws is related to electric flux?





Correct Answer : B) Gauss's Theorem. It states that the electric flask over any closed surface is proportional to the total charge enclosed by that surface and it is `\frac{1}{E0}` times the total charge.

7. Blood clots are detected by which of the following radio isotopes?





Arsenic -74 is used to detect the presence of tumors.

Iodine -131 is used to study the activity of thyroid gland.

For detection of anaemia Iron- 59 is used.

8. In deserts, the day become very hot and night becomes very cold. It happens due to?





Specific heat of a substance determines the rate of heat absorption and release. If the value of specific heat is lower, the substance will get very hot in presence of any heat supplying source and become cold as soon as the source disappears. As the sand has low specific heat, it gets hot during daytime and gets cold during night.

Water has the highest specific heat of value 01.

The specific heat of any substance ranges from 00 to 01.

9.Which of the following acids contains no COOH group ?





Organic acid generally contains COOH group. Ascorbic acid which is generally known as vitamin C does not contain any COOH group.

10. Which of the following is not correct regarding electric field lines ?





In case of single charge, the electric field lines can be terminated at infinity. Options A and B are correct.

11. Coconut charcoal is used in the separation process of





Correct Answer : Inert gases. Any explanation will be proved redundant.

12. Thermodynamically which of the following is the most stable allotrop of carbon?





Graphite is thermodynamically the most stable allotrop of carbon.

Diamond is the hardest allotrop of carbon because of its tetrahedral crystal lattice.

Graphite is a good conductor of electricity and heat but diamond is good conductor of heat only.

The hardest element found in the earth is boron carbide.

13. How many natural amino acids are there ?





There are 20 number of amino acid that we get naturally. The number of amino acid which are essential for human body is 8.

14. Which of the following ink is prepared from ?





Correct Answer : Tanin

No explanation required

15. Casuarina is a 





Correct Answer : Xerophyte

Xerophyte is a plant species which requires very little water to survive. The plants found in the desert region is categorized as Xerophyte.

16. Which of the following can produce formic acid ?





Correct Answer : Red Ant.

17. Acetylene is produced when is treated with





When calcium carbide (CaC²) is treated with water acetylene is produced. CaC₂ + 2H₂O = Ca(OH)₂ + C₂H₂

18.If the diameter of a capillary tube is tripled, the rise of water through it will be





Correct Answer : A) One third

The height of water rise is inversely proportional to the radius or diameter of the capilary.

19. Which of the following element can enhance the absorption of water and calcium in plants?





Correct Answer : B) Boron.

For plants or animal, Boron is considered as a trace element i.e; Very little anount of it is required for the metabolisom.

20. The shape of RBC is





Correct Answer : D) Biconcave disc.

The advantage of being bi-concave is that the surface area is increased and hence much oxygen is carried by the RBC to the cell.

The most important advantage of RBC being Bi-concave is that it can get folded while passing through the narrow capilaries.

21. Which of the following element is used in the purification of water ?





Correct Answer : A) Potash alum.

Potassium Nitrate is used to make gun powder.

22. Which of the following is a Lewis base ?





Correct Answer : D) Both A and B.

What is Lewis base ?

The molecule with a lone pair of electron which the molecule can donate to a receiver molecule is called a Lewis base.

23. Which of the following statement is false ?




Correct Answer : D) None of the above.

Glyoxysomes are naturally found in plant.

24. The process of cleaning the oil spill by using bacteria is called





Correct Answer : B) Bio- remediation.

What is Bio-remediation ? It is a process to solve environmental issues using biological agent.

25. The optimum value of dissolved oxygen in water is





Correct Answer : B) 5-6 ppm.

The full form of ppm is Parts per million. It is used

1) to measure the amount of dust particle in the air

2) Amount of dissolve material in water etc.