(A) 4 days
(B) 12 days
(C) 16 days
(D) 8 days
Answer: (D) 8 days
Q. The time required for a quantity to reduce to half of its initial value of a radioactive element is called:
(A) Half-life
(B) Divided-life
(C) Decreased-life
(D) None of these
Answer: (A) Half-life
Q. What is the half-life of Polonium-210?
(A) 138.376 days
(B) 148.376 days
(C) 158.376 days
(D) 168.376 days
Answer: (A) 138.376 days
(A) 2
(B) 3
(C) 0
(D) 4
Answer: (C) 0
Q. What is the name of heating device used to aid starting diesel engines?
(A) Glow plug
(B) Spark plug
(C) Thermostat plug
(D) None of these
Answer: (A) Glow plug
Q. The diesel engine also known as a compression-ignition (CI) engine is named after:
(A) Casey Diesel
(B) Rudolf Diesel
(C) Randall Diesel
(D) None of these
Answer: (B) Rudolf Diesel
(A) In asteroid belt between the orbits of Mars and Jupiter
(B) In asteroid belt between the orbits of Mars and Venus.
(C) In asteroid belt between the orbits of Jupiter and Venus.
(D) Everywhere in the sky.
Answer: (A) In asteroid belt between the orbits of Mars and Jupiter
Q. Minor planets, especially of the inner solar system are:
(A) Planetiods
(B) Asteroids
(C) Meteroroids
(D) None of these
Answer: (B) Asteroids
Q. Larger asteroids also known as:
(A) Planetiods
(B) Asteroids
(C) Meteroroids
(D) None of these
Answer: (A) Planetiods
(A) Optical fibre
(B) Transistor
(C) Decoder
(D) Photo diode
Answer: (D) Photo diode
Q. LED generates light with the help of charge carriers, it converts:
(A) Electrical enery into light energy
(B) Light energy in to electrical energy
(C) Electrons in to light
(D) None of these
Answer: (A) Electrical energy in to light energy
Q. What is “LED” stands for?
(A) Light emitting display
(B) Light emitting diode
(C) Low energy display
(D) None of these
Answer: (B) Light emitting diode
(A) Troposphere
(B) Ionosphere
(C) Mesosphere
(D) Stratosphere
Answer: (B) Ionosphere
Q. The ionized part of Earth’s upper atmosphere from about 60 km to 1000 km altitude and it is ionized by solar radiation is known as:
(A) Ionosphere
(B) Troposphere
(C) Mesosphere
(D) Stratosphere
Answer: (A) Ionosphere
Q. The region below the Ionosphere is called:
(A) Troposphere
(B) Mesosphere
(C) Neutrosphere
(D) Stratosphere
Answer: (C) Neutrosphere