Which one of the following is used to make periscope?
(A) Concave lens
(B) Concave Mirror
(C) Plane Mirror
(D) None of the above
1. Which plane mirror is used to make periscope?
2. An optical instrument used to see through an object that is occluded from the direct line of sight is called a periscope.
3. A periscope consists of two plane mirrors placed at an angle of 45°.
4. When light falls on one of the mirrors then after reflection from the first mirror it falls on the second mirror which further reflects it and falls on the eye of the observer.
Of these, the cultivation of olives is studied in …….?
(A) agriculture
(B) olivoculture
(C) Olericulture
(D) apiculture
1. Among these, olive cultivation is studied in olivoculture.
2. Olives originated in the region of Southern Europe near the Mediterranean Sea. Currently, the largest producing countries are in the same region, with Spain, Italy, Morocco, Turkey and Greece being the largest producers.
The biological process through which the toxic residual substance formed in the body due to metabolic process is called-
(A) Excretion
(B) Respiration
(C) Circulation
(D) Digestion
1. Excretion is the process in which all metabolic wastes are passed out of the body. Excretion in humans occurs in several processes through various organs and internal organs of the body.
2. Diffusion is the most common process of excretion in lower organisms. The human body is an extraordinary machine, where various life-processes (respiration, circulation, digestion, etc.) occur simultaneously. As a result, many of the waste products produced in our bodies are in various forms including carbon dioxide, water, and nitrogenous products such as urea, ammonia, and uric acid.
The nervous systems of animals are composed of highly specialized cells called-
(A) hepatic cells
(B) nephrons
(C) neurons
(D) mucus cell
1. Neurons are the building blocks of the nervous system. They receive and transmit signals to different parts of the body. This is done in both physical and electrical forms. Many different types of neurons facilitate the transmission of information.
2. Neurons are the structural and functional unit of the nervous system. All neurons have three distinct parts – dendrites, the cell body, and the axon. Neuron structure is specially adapted to quickly carry messages in the form of electrical signals over large distances in the body.
Which lobe of the brain is responsible for hearing?
(A) Parietal lobe
(B) Frontal lobe
(C) Occipital lobe
(D) Temporal lobe
1. Temporal lobe – integrates memories with the senses of taste, sound, sight, and touch.
2. Parshivika Pali – Holds information about temperature, taste, touch and movement.
3. Frontal lobe – responsible for communicative functions and control of voluntary movement or activity.
4. Occipital lobe – responsible for vision
The escape velocity of the Earth is?
(A) 15.0 km/sec
(B) 21.1 km/sec
(C) 7.0 km/sec
(D) 11.2 km/sec
1. The lowest velocity used to escape the gravitational pull of the Earth is called escape velocity.
2. The escape velocity of the Earth is 11.2 km/second.
Which is called the emergency hormone in the human body?
(A) Thyroxin
(B) Insulin
(C) Adrenaline
(D) Progesterone
1. It is secreted in the adrenal gland into the medulla as well as in some neurons of the central nervous system.
2. It is known as an emergency hormone because it initiates an instant response that causes the person to think about the stress and react quickly.
Which one of the following is not an antioxidant?
(A) Vitamin E
(B) Selenium
(C) Lycopene
(D) Aspartame
All of the following are peroxidases.
(A) Vitamin E
(B) Selenium
(C) LycopeneInvoluntary actions like blood pressure and vomiting are controlled by which part of hindbrain?
(A) Medulla oblongata
(B) Pons
(C) Cerebellum
(D) Cerebrum
1. Involuntary actions like blood pressure, salivation and vomiting are controlled by the medulla.
2. The medulla oblongata, also called the medulla, is the lowest part of the brain and the lowest part of the brainstem.
3. The medulla oblongata or simply the medulla is a long stem-like structure that is part of the brain.
Which organism causes the Kala-azar disease?
(A) Amoeba
(B) Plasmodium
(C) Planaria
(D) Leishmania
1. Kala-azar disease is caused by the protozoa Leishmania donovani.
2. It is a parasitic protozoa that belongs to the class Mastigophora or Flagellata. It is caused by sand fly (Phlebotomus) which causes kala azar or dumdum fever.
Get the Examsbook Prep App Today