General Science for Civil Services Preliminary Exams

1.Which component in light causes suppression of melatonin produced by the pineal gland?
(A)Red
(B)Blue
(C)Green
(D)Indigo
(E)Yellow

Ans. (B) Blue, studies show it is the blue component in light that causes suppression of melatonin. By blocking blue light by wearing goggles with filters, an experiment demonstrated that the subjects continued making melatonin in a normal manner.

2.The combination of a Red Glass Plate and a Blue Glass plate will transmit which of the following light?
(A)Red light
(B)Blue Light
(C)Green Light
(D)Yellow Light
(E)No Light

Ans. (E) No Light
3.Which among the following statement is correct about Fluorescence?
(A)High Energy Photon is absorbed and low energy photon is emitted
(B)Low Energy Photon is absorbed and high energy photon is emitted
(C)High Energy Photon is absorbed and electron is emitted
(D)Low Energy Photon is absorbed and electron is emitted
(E)None of the above

Ans. (A) High Energy Photon is absorbed and low energy photon is emitted

4.Cassiterite is an ore of which of the following ?
(A)Iron
(B)Aluminum
(C)Tin
(D)Silver
(E)None of the above

Ans. (C) Cassiterite is SnO2 or Tin Oxide

5.Most part of the Cosmic rays that impinge on earth’s atmosphere are __?
(A)Electrons
(B)Protons
(C)Neutrons
(D)Gamma rays
(E)Photons

Ans. (B) Protons, Almost 90% of all the incoming cosmic ray particles are protons, almost 10% are helium nuclei (alpha particles), and slightly under 1% are heavier elements and electrons (beta minus particles).
6.Steel is an alloy consisting mostly of iron, with a carbon content between 0.2% and 2.1% by weight. An increasing amount of steel will result in which of the following?
(A)Increase Hardening
(B)Decrease Hardening
(C)Increase ductility
(D)Increase melting Point
(E)None of the above

Ans. (A) Increase Hardening. More carbon means more hardness, less ductile and less melting point

7.Who among the following proved that Bacteria don’t originate by spontaneous generation?
(A)Redi
(B)Pasteur
(C)Hooke
(D)Shleiden
(E)K. Koch

Ans. (B) Pasteur

8.The blood pressure is denoted as following?
(A)Systolic Pressure / Diastolic Pressure
(B)Diastolic Pressure / Systolic Pressure
(C)Venous Pressure / Systolic Pressure
(D)Systolic Pressure / Pulse Pressure
(E)Venous Pressure / Pulse Pressure

Ans. (A) Systolic Pressure / Diastolic Pressure

9.Newton-meters per second is represented as follows?
(A)Ohm
(B)Volt
(C)Watt
(D)Calorie
(E)Ampere

Ans. (C) Watt one watt is the rate at which work is done when an object is moved at a speed of one meter per second against a force of one Newton.

10.Which among the following is not an Enzyme?
(A)Gastrin
(B)Ptyalin
(C)Pepsin
(D)Rennin
(E)Diastase

Ans. (A) Gastrin, It is a hormone, stimulates secretion of gastric acid (HCl) by the parietal cells of the stomach and aids in gastric motility

11.What would be the percentage of Glucose in the Urine of a healthy person?
(A)less than 1%
(B)More than 1%
(C)More than 0.1%
(D)0%
(E)2%

Ans. (D) 0%

12.Some times back a new type of atomic clock, has been demonstrated whose accuracy is expected to be within one second in 100 million years. This will use which of the following instead of Cesium?
(A)Mercury
(B)Palladium
(C)Zirconium
(D)Chromium
(E)Cadmium

Ans. (A) Mercury

13.A Cyclotron is ___?
(A)A charged particle
(B)A particle Accelerator
(C)A magnetic particle
(D)A radioactive particle
(E)None of the above

Ans. (B) A Particle Accelerator

14.A four chambered heart is found in which of the following?
(A)mammals only
(B)mammals and fish
(C)mammals & Birds
(D)mammals and Amphibians
(E)None of the above

Ans. (C) C is correct Archosaurs (crocodilians and birds) and mammals show complete separation of the heart into two pumps, for a total of four heart chambers;

15.Which among the following is not a carnivorous plant?
(A)Pitcher plant
(B)Venus Fly Trap
(C)waterwheel plant
(D)Bladderwort
(E)Marsh Mallow

Ans. (E ) Marsh Mallow a medicinal plant and ornamental plant.

16.Standard time zones can be defined by geometrically subdividing the Earth’s spheroid into how many parts?
(A)12
(B)24
(C)36
(D)360
(E)48

Ans. (B) 24

17.What is the atomic number of Transuranic elements?
(A)Greater than 90
(B)Greater than 92
(C)Greater than 91
(D)Greater than 93
(E)Greater than 96

Ans. (B) Greater than 92 (the atomic number of uranium).

18.In thermodynamics, the triple point of a substance is ______at which three phases (for example, gas, liquid, and solid) of that substance coexist in thermodynamic equilibrium. Which among the following fills the blank most suitably?
(A)temperature
(B)pressure
(C)temperature and pressure
(D)temperature and pressure & density
(E)None of the above

Ans. (C) temperature and pressure

19.Who among the following worked on Tuberculosis?
(A)Robert Koch
(B)Karl Ernst von Baer
(C)Erwin Neher
(D)Richard Goldschmidt
(E)Paul Langerhans

Ans. (A) Robert Koch

20.Sun Eclipse occurs at which of the following phases of Moon?
(A)Full Moon
(B)Half moon
(C)New Moon
(D)Either Full Moon or New Moon
(E)Either New Moon or Half moon

Ans. (C) New Moon