General Science - Mock Test 48

Question 471

The chief constituent of gobar gas is?

A) ethane B) methane C) hydrogen D) carbon dioxide

---

No Details

Question 472

What is the function of a dynamo?

A) To convert heat energy into light energy B) To convert light energy into heat energy C) To convert mechanical energy into electrical energy D) To convert electrical energy into mechanical energy

---

No Details

Question 473

Which of the following acts as a resistance against disease in the body?

A) Carbohydrates B) Red corpuscles C) Vitamins D) White corpuscles

---

No Details

Question 474

The chief purpose of crop rotation is to check the loss of topsoil?

A) by water erosion B) by wind erosion C) by weathering D) of its mineral content

---

No Details

Question 475

All of the following are examples of chemical changes except the?

A) magnetizing of iron B) rusting of iron C) digestion of food D) sourcing of milk

---

No Details

Question 476

The greatest value of bees to mankind is in?

A) supplying of food for birds B) insurance pollination of certain crop plants C) storing honey for man’s use D) Furnishing beeswax needed in certain specialized industries

---

No Details

Question 477

An electric bell is placed inside a bell jar which is connected to a vacuum pump. When the bell jar is completely evacuated?

A) no sound can be heard B) the loudness of the sound will remain unchanged C) the loudness of the sound will increase D) the loudness of the sound will decrease

---

No Details

Question 478

How can the spherical aberration of a human eye be corrected?

A) By using a cylindrical B) By using a plano-convex lens C) By using a thin lens D) None of the above

---

No Details

Question 479

Astigmatism (for a human eye) can be emerging out of the drop?

A) concave lens B) convex lens C) cylindrical lens D) prismatic lens

---

No Details

Question 480

Primary rainbow is formed when light suffers?

A) two internal refractions before emerging out of the drop B) one internal refraction before emerging out of the drop C) no internal refraction D) either one or two internal refractions before emerging out of the drop

---

No Details