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Q : In optics, the refractive index of a substance is described by the formula n = c/v, where c is:
(A) the speed of light in medium
(B) the centre of curvature
(C) the radius of the sphere
(D) the speed of light in vacuum
Refractive Index Formulan is the refractive index. c is the velocity of light in a vacuum ( 3 × 108 m/s) v is the velocity of light in a substance.
The apparent weight of a person in a lift is less than the actual weight when the lift is moving?
(A) up with acceleration
(B) down at the same speed
(C) up with uniform speed
(D) down with acceleration
Which of the following is the universal recipient blood group?
(A) A
(B) B
(C) AB
(D) 0
Blood group AB consists of both A and B antigen and no antibodies . It is known as universal recipient.
Which of the following led to the expulsion of milk from the breast during suckling?
(A) Prolactin
(B) Oxytocin
(C) Vasopressin
(D) Estrogen and Progesterone
Oxytocin is an oligopeptide hormone secreted by pars nervosa of pituitary glands of birds and mammals and is involved in contraction of alveoli of mammary glands during release of milk.
Which of the following is the volume of urine produced in an adult human every 24 hours?
(A) 1 litre
(B) 1.5 litres
(C) 3.0 litres
(D) 5.0 litres
The normal range for 24-hour urine volume is 800 to 2,000 milliliters per day (with a normal fluid intake of about 2 liters per day). The examples above are common measurements for results of these tests. Normal value ranges may vary slightly among different laboratories.
In which form the chemical compound RDX is used?
(A) As an composition
(B) As an reactor
(C) As an explosive
(D) As an nuclear weapon
RDX is used as an explosive and is also used in combination with other ingredients in explosives. Its odor and taste are unknown. It is a synthetic product that does not occur naturally in the environment. It creates fumes when it is burned with other substances.
Chemistry is a branch of science which can be used for providing the services to mankind. Comment on the statement.
(A) True
(B) False
(C) May Be
(D) Strongly not
Chemistry is a branch of natural science that deals principally with the properties of substances, the changes they undergo, and the natural laws that describe these changes.
Tell the composition of soap.
(A) Sodium salt with fatty acids.
(B) Potassium salt with fatty acids
(C) Both a & b
(D) Sodium and Potassium salt mixed with chemicals
Soaps are defined as salts of fatty acids, which are prepared by neutralizing the corresponding fatty acid or oil with a base, such as sodium hydroxide, potassium hydroxide, ammonium hydroxide or triethylamine.
Which of the following compounds is not used as an alkali?
(A) Sodium hydroxide
(B) Potassium hydroxide
(C) Carbon hydroxide
(D) Nitrogen hydroxide
Expert-Verified AnswerNitrogen hydroxide is not used as an alkali as it is an acid. The other name of Nitrogen hydroxide is Nitric acid.
Which of the following teeth of the child (3-4 Years) is not a part of the milk teeth?
(A) Incisors
(B) Canines
(C) Molars
(D) Premolars
Premolars are developed once the milk teeth fall off and when the permanent teeth start growing. Hence, premolars are not a part of the milk teeth and are only seen in a permanent set of teeth.
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