Q.1: In a simple astronomical telescope, the objective and the eyepiece used respectively, are:
a) a convergent lens and a divergent lens.
b) a divergent lens and a divergent lens.
c) a divergent lens and a convergent lens.
d) a convergent lens and a convergent lens.
Ans: d) a convergent lens and a convergent lens.
Q.2: Twinkling of a star is due to :
a) Interference of light
b) Refraction of light
c) Polarization of light
d) Diffraction of light
Ans: b) Refraction of light.
Imp Facts:
The twinkling of stars scientifically known as stellar scintillation is caused by atmospheric refraction.
Q.3: Which one of the following metals is widely extracted by the electrolysis of its molten
compound?
a) Cu
b) Au
c) Sn
d) Na
Ans: d) Na (Sodium).
Imp Facts:
Sodium (Na) is a highly reactive metal belonging to the first group (alkali metals) of the periodic table. Because of its high reactivity, it cannot be reduced using carbon or other common chemical reducing agents. Instead, it is extracted through the electrolysis of its molten compound (usually molten sodium chloride).
Q.4: Which one of the following is an example of airborne disease?
a) Tuberculosis
b) Malaria
c) Dengue
d) Cholera
Ans: a) Tuberculosis (TB).
Imp Facts:
Tuberculosis is caused by the bacterium Mycobacterium tuberculosis. It is classified as an airborne disease because the bacteria are expelled into the air when an infected person coughs, sneezes, speaks, or sings. These tiny particles (droplet nuclei) can remain suspended in the air for several hours and can be inhaled by others.
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Q.5: Which one of the following is not a part of the male reproductive system in human beings?
a) Prostate Gland
b) Testis
c) Cervix
d) Scrotum
Ans: c) Cervix
The Cervix is a cylinder-shaped neck of tissue that connects the vagina and the uterus. It is a critical part of the female reproductive system, acting as a passageway for menstrual flow, sperm, and a baby during childbirth.
Q.6: Which of the following are the different parts of a human brain?
a) Forefront brain, Standard brain and Hind brain
b) Fore brain, Median brain and Rear brain
c) Fore brain, Mid brain and Hind brain
d) Precursor brain, Mean brain and Hind brain
Ans: c) Fore brain, Mid brain and Hind brain
Imp Facts:
The human brain is an incredibly complex organ. It is divided into these three primary regions: ***Forebrain (Prosencephalon): This is the largest and most highly developed part of the human brain. It includes the Cerebrum (responsible for thinking, memory, and voluntary actions), the Thalamus (a sensory relay station), and the Hypothalamus (which regulates body temperature, hunger, and hormones).
***Midbrain (Mesencephalon): The smallest region of the brain, located between the forebrain and hindbrain. It serves as a vital connection point for sensory information, particularly visual and auditory reflexes, and helps control eye movement.
***Hindbrain (Rhombencephalon): This region connects the brain to the spinal cord. It consists of the Cerebellum (precision and balance), the Pons, and the Medulla Oblongata (which controls involuntary actions like breathing, heart rate, and swallowing).
Q.7: Tooth enamel of humans is made up of:
a) Calcium phosphate
b) Sodium hydrogen carbonate
c) Sodium hydroxide
d) Lactic acid
Ans: a) Calcium phosphate.
Imp Facts:
Tooth enamel is the hardest substance in the human body. It is primarily composed of a crystalline form of calcium phosphate known as hydroxyapatite. Tooth Enamel is approximately 96% mineral, making it even tougher than bone. The remaining 4% consists of water and organic material (proteins). Hydroxyapatite mineral provides the structural strength necessary for chewing and protects the sensitive inner layers of the tooth (dentin and pulp) from decay and temperature changes.
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