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Q : Which of the following statements best describes the nature of science?
(A) science is a system of beliefs.
(B) science is social in nature.
(C) scientists are totally objective in their work.
(D) scientific method is the only guide for conducting research.
The statement that best describes the nature of science is statement: C. Scientific ideas change over time as new information is discovered. This is 100% true and it is why we, as humans, continue to research concepts and build upon them day in and out.
Deficiency of vitamin ‘X’ causes bleeding of gums. This vitamin is essential for the absorption of mineral ‘Y’ and ‘X’ is found in food ‘Z’. Identify X, Y and Z.
(A) X-vitamin D, Y- calcium, Z-milk product
(B) X-vitamin C, Y-iron, Z-citrus fruits
(C) X-vitamin B, Y-calcium, Z-green leafy vegetables
(D) X-vitamin A, Y-phosphorus, Z-poultry products
Vitamin A deficiency can lead to night blindness and poor vision. B vitamins are a class of water-soluble vitamins. Vitamin B refers to several different types of vitamins that, together, are known as the B-complex vitamins. The commonly used Vitamin B Complex is constituted of 8 vitamins. Thiamin (vitamin B-1) Riboflavin (vitamin B-2) Niacin (vitamin B-3) Pantothenic acid (vitamin B-5) Vitamin B-6 Biotin (vitamin B-7) Folate (vitamin B-9) Vitamin B-12 Deficiency of Vitamin C can cause scurvy, a disease that is characterised by bleeding gums, skin spots, and swelling in joints. It also affects the immune system and can even be fatal in acute conditions. Vitamin C has been shown to enhance iron absorption. It captures non-heme iron and stores it in a form that's more easily absorbed by your body. Foods high in vitamin C include citrus fruits, dark green leafy vegetables, bell peppers, melons and strawberries. Citrus fruits are an excellent source of vitamin C. So from the above points, we can say that- 'X' = Vitamin C 'Y' = Iron (mineral) 'Z' = (Food) Citrus fruits
Identify the correct statement from among the following :
(A) The proportion of fine particles in sandy soil is relatively higher than in the clayey soil.
(B) The amount of large and fine particles is about the same in clayey soil.
(C) The proportion of large particles in loamy soil is relatively higher than in the sandy soil.
(D) The proportion of fine particles in clayey soil is relatively higher than in the loamy soil.
Which of the following properties of light can be used to explain the phenomenon of shadow formation?
A. Light travels in a straight line.
B. Light travels at a high speed.
C. Light is composed of seven colours.
D. Light does not pass through opaque objects.
(A) A and B
(B) B and C
(C) C and D
(D) D and A
The reflected light reaches our eyes and make that thing visible to us. Luminous objects like Sun, stars, electric bulbs etc have their own light and they are considered a source of light. Non Luminous objects are those objects which do not have their own light but reflect the light coming from some source.
Which of the following will not be helpful in the process of separating a mixture of salt and water?
(A) Decantation
(B) Filteration
(C) Distillation
(D) Boiling
Distillation, Boiling and Filteration (reverse osmosis) are helpful to separate the mixture of salt and water. Decantation only separates insoluble solids that settle on the bottom; thus, it cannot be used to separate a mixture of salt and water.
Which of the following sets comprises chemical changes?
(A) Boiling of water, breaking of glass, rusting of iron
(B) Dissolving salt in water, digestion of food, shredding of paper.
(C) Cooking of food, boiling of water, dissolving sugar in water.
(D) Rusting of iron, burning of paper, digestion of food
Which of the following sets comprises liquids which are poor conductors of electricity ?
(A) tap water, shampoo, honey
(B) salt solution, lemon juice, vinegar
(C) shampoo, vegetable oil, distilled water
(D) sugar solution, vinegar, lemon juice
Which of the following glands in human beings secretes more than two hormones?
(A) Adrenal
(B) Pituitary
(C) Pancreas
(D) Thyroid
Pituitary gland: It is a small pea-sized gland. It is often called the master gland as it controls several other hormone glands in our body. It is located in the brain between Hypothalamus and the Pineal gland. So, the pituitary gland in human beings secretes more than three hormones.
Which of the following statements is true?
(A) All metals are solids.
(B) All metals are hard.
(C) All non-metals are gases.
(D) All non-metals are non-ductile.
‘Y’ is a man-made fibre obtained from a natural source. What could be ‘Y’?
(A) Rayon
(B) Nylon
(C) Acrylic
(D) Jute
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