General Science GK Questions (MCQ) for SSC, NDA, CDS, UPSC, UPPSC and other State PSC Examinations.
1. ___ contributes towards global warming so it is called a greenhouse gas:
[A] Oxygen
[B] Methane
[C] Nitrogen
[D] Hydrogen
B [Methane]
Notes:
Methane (CH4) is one of the most significant greenhouse gases along with water vapor (H2O), carbon dioxide (CO2) and nitrous oxide (N2O). Methane (CH4) – like carbon dioxide, is a gas emitted by both natural and man-made sources that absorbs heat and warms the atmosphere.
2. The smallest flowering plant is ____:
[A] Lemma
[B] Wolffia
[C] Ficus
[D] Azolla
B [Wolffia]
Notes:
Wolffia is a genus of 9 to 11 species which include the smallest flowering plants on Earth. Commonly called water-meal or duckweed, these aquatic plants resemble specks of cornmeal floating on the water. Wolffia species are free-floating thalli, green or yellow-green, and without roots. The flower is produced in a depression on the top surface of the plant body. It has one stamen and one pistil.
3. Tears in the eyes are produced by which of the following gland/glands?
[A] Lacrimal glands
[B] Thyroid gland
[C] Pituitary gland
[D] Hypothalamus gland
A [Lacrimal glands]
Notes:
Tears are a clear liquid secreted by the lacrimal glands (tear ducts) in the eyes of all land mammals. The lacrimal glands are situated in the upper lateral region of each orbit, in the lacrimal fossa of the orbit formed by the frontal bone. They are paired, almond-shaped exocrine glands, one for each eye.
4. Animals having open circulatory system possesses ____:
[A] Coelenteron
[B] Spongocoel
[C] Pseudocoel
[D] Haemocoel
D [Haemocoel]
Notes:
Open circulatory system is the one in which blood does not circulate only inside blood vessels but it also falls in cavities that irrigate tissues. The internal organs are suspended in a network of blood-filled sinuses or open spaces which collectively form the haemocoel such as in cockroach and other insects.
5. Which of these is the energy conversion that happens in the process called photo synthesis?
[A] Potential energy to chemical energy
[B] Light energy to chemical energy
[C] Heat energy to chemical energy
[D] Heat energy to light energy
B [Light energy to chemical energy]
Notes:
During the process of photosynthesis, light penetrates the cell and passes into the chloroplast. The light energy is intercepted by chlorophyll molecules on the granal stacks. Some of the light energy is converted to chemical energy. During this process, a phosphate is added to a molecule to cause the formation of ATP.
6. Which part of brain is also known as “little brain”?
[A] Cerebrum
[B] Cerebellum
[C] Thalamus
[D] Hypothalamus
B [Cerebellum]
Notes:
The cerebellum is known as little brain. It is a region of the brain that plays an important role in motor control. i.e. in maintaining and coordinating body posture at different times of the day/night.
7. Which of the following type of medicine is used for treating indigestion?
[A] Antacid
[B] Analgesic
[C] Antibiotic
[D] Antiseptic
A [Antacid]
Notes:
An antacid is a substance which neutralizes stomach acidity and is used to relieve heartburn, indigestion or an upset stomach. When excessive amounts of acids are produced in the stomach the natural mucous barrier that protects the lining of the stomach can damage the esophagus in people with acid reflux. Antacids contain alkaline ions that chemically neutralize stomach gastric acid, reducing damage and relieving pain.
8. Iodoform is used as an _____:
[A] Antiseptic
[B] Analgesic
[C] Anaesthetic
[D] Antipyretic
B [Analgesic]
Notes:
Iodoform is the organoiodine compound with the formula CHI3. A pale yellow, crystalline, volatile substance, it has a penetrating odor and, analogous to chloroform, sweetish taste. It is occasionally used as a disinfectant. Adolf Hitler’s mother, Klara Hitler, died of iodoform poisoning brought on by her treatment for breast cancer.
9. How does a Unicellular Organism reproduce?
[A] Cell reproduction
[B] Cell synthesis
[C] Fragmentation
[D] Cell division
D [Cell division]
Notes:
Unicellular organisms reproduce by asexual means. This asexual mode of reproduction involves cell division in which single parent produce their offspring. For simple unicellular microorganisms such as the amoeba, one cell division is equivalent to reproduction – an entire new organism is created. Different asexual modes of reproduction include binary fission, multiple fission, fragmentation, budding etc.
10. Which of the following statements are correct?
- The soap molecules form structures called micelles.
- Soap micelles cannot scatter light.
- Oily dirt gets collected in the centre of the micelle.
Select the correct answer from the codes given below:
[A] Only 1 and 2
[B] Only 1 and 3
[C] Only 2 and 3
[D] All of the above
B [Only 1 and 3]
Notes:
When soap is mixed in water a colloidal solution is formed. The soap solution has soap micelles which are an aggregate of soap molecules. It is sphericalin shape and helps in dissolving the dirt in water. The soap micelles are large enough to scatter light and that’s why a soap solution appears cloudy.