Correct Answer : B Explanation : Answer: B) Methane
Explanation: The main constituent of biogas is methane (55-70%), CO2 (30-45%) and some traces of gases such as H2S and ammonia.
Biogas is produced under anaerobic conditions; the process is denominated as anaerobic digestion.
Q : Reflex actions are controlled by
(A) the Brain
(B) the Spinal Chord
(C) the Nerves
(D) the Cells
Correct Answer : B Explanation : Answer: B) The Spinal Chord
Explanation: A reflex arc is a neural pathway that controls a reflex. In vertebrates, most sensory neurons do not pass directly into the brain, but synapse in the spinal cord. This allows for faster reflex actions to occur by activating spinal motor neurons without the delay of routing signals through the brain.
Q : Which of the following are examples of plagiarism?
I. Using someone else's idea in your own writing, and including an in-text citation that links to a works-cited list. II. Using someone else's words in your writing without putting quotation marks around them. III. Reproducing a drawing or diagram without including information about where you found it.
(A) II only
(B) I only
(C) I and III only
(D) II and III only
Correct Answer : D Explanation : Answer: D) II and III only
Explanation: Plagiarism is when you copy someone's work and try to pass it off as your own. Plagiarism can be a violation of copyright laws and can be considered cheating, resulting in you getting a failing grade or even being kicked out of school.
Q : Mr. Shankar spends 25% of his monthly salary on household expenditure, 20% of the remaining on children’s education, and the remaining is equally invested in three different schemes. If the amount invested in each scheme is Rs.5600, what is the monthly salary of Shankar ?
(A) Rs. 34000
(B) Rs. 31245
(C) Rs. 24315
(D) Rs. 28000
Correct Answer : D Explanation : Answer: D) Rs. 28000
Explanation: Let the monthly salary of Shankar be = Rs.xAmount invested on expenditure = 25% = x/4;Remaning amount = 3x/4;Amount invested on children education = 20% i.e = 3x/20;Remaining amount = 3x/4 - 3x/20 = 3x/5;Remaining amount invested in three different schemes i.e is 1/3(3x/5) => x/5 = 5600Therefore x = 28000Hence, Monthly salary of Shankar is Rs. 28,000.
Q : Plants growing in sunlight are called
(A) sciophytes
(B) xerophytes
(C) heliophytes
(D) hydrophytes
Correct Answer : C Explanation : Answer: C) heliophytes
Explanation:
Q : The human heart is
(A) Neurogenic heart
(B) Myogenic heart
(C) Pulsating heart
(D) Ampullary heart
Correct Answer : B Explanation : Answer: B) Myogenic heart
Explanation: Hearts are of several types. In some invertebrates the heart is simulated by the nervous system to do its work. Such hearts are called Neurogenic hearts. The Human heart is myogenic. i.e, it recieves the stimuli for contraction from the muscular node called sinu-auricular node or pace maker.
Q :
Which one of the following elements exhibits the greatest tendency to lose electrons?
(A) Fluorine
(B) Lithium
(C) Oxygen
(D) Zinc
Correct Answer : B
Q :
The planet which has the highest surface temperature is
(A) Jupiter
(B) Earth
(C) Pluto
(D) Venus
Correct Answer : D
Q :
The colour of the ocean appears to be blue because the sunlight falling on it is-
(A) Reflected
(B) Refracted
(C) Diffracted
(D) Scattered
Correct Answer : D
Q :
The basic structural and functional unit of living organisms is-