[ Question Bank ] - 2022 — Science STD 10 — Question

The partially digested food coming from the stomach of a person enters a long and narrow organ A in his body. The organ A receives the secretion of two glands: liver and pancreas. Liver secretes a greenish - yellow liquid B which is normally stored in the organ C. Pancreas secretes pancreatic juice which contains three digestive enzymes D, E and F. The intestinal juice completes the process of digestion of food. The inner wall of organ A has millions of tiny finger - like projections G which help in the rapid absorption of digested food into blood stream. The undigested part of food then passes into wider tube H which absorbs most of the water from undigested food. The last part of tube H called I stores this undigested food (or waste) for some time. The undigested food is then passed out though opening J as faeces in the process known as K.

1. Name the organ A.
2. Name liquid B and organ C.
3. What are the digestive enzymes D, E and F?
4. Name the projections G present on the inner wall of organ A.
5. Name Tube H, Part I, Opening J and Process K.

Express the magnification produced by a lens in terms of the focal length of the lens and (1) the object distance (2) the image distance.

The gland A is attached to the wind pipe in the human body. The gland A makes and secretes a hormone B which controls the metabolism of carbohydrates, fats and proteins in the body. The non-metal element C is necessary for the formation of hormone B. The deficiency of C in the diet can cause a deficiency of hormone B in the body leading to a disease D in which the neck of a person appears to be swollen. People are advised to use salt E in cooking food so as to avoid disease D.

1. Name (i) gland A, and (ii) hormone B.
2. What is the element C?
3. Name one type of food which can provide sufficient C in the diet of a person.
4. Name (i) disease D, and (ii) salt E.

Refraction observed in the atmosphere.

A group of students measured the pH of some substances they found in their homes. Their results are given in the following table:

Sabstance	pH	Sabstance	pH
Apples	3.0	Salt	7.0
Baking soda	8.5	Sugar	7.0
Black coffee	5.0	Toothpaste	9.0
Houshold ammonoa	12.0	Vinegar	3.0
Lemon juoce	2.5	Wasimg soda	11.5
Milk	6.0

1. What would the students have used to measure the pH?
2. Which solution is the most acidic (c) Which solution is the most alkaline?
3. Which solutions are neutral?
4. Which solution can be used to treat wasp stings?
5. Which solution can be used to treat bee stings?

Explain the hydraulic separation method with a neat labelled diagram.

Anodes need to be replaced from time to time during the electrolysis of alumina.

Write short note: Dolly.

Write short notes on the following: Electroplating.