(C) It decreases persons volume to help him float.
(D) A persons can sit on it
Correct Answer : B
Q :
‘Farad’ is the unit of:
(A) Resistance
(B) Conductanc
(C) Capacitance
(D) Inductance
Correct Answer : C
Q :
Communication satellites are used to -
(A) provide information of natural resources only
(B) transmit communication signal only
(C) receive communication signal only
(D) receive and redirect communication signal
Correct Answer : D
Q :
Biological Oxygen Demand (BOD) is used as a standard measure of __________.
(A) Oxygen level in water system
(B) Oxygen level in atmosphere
(C) Oxygen level in forest system
(D) Oxygen level in animals
Correct Answer : A
Q :
Activity of brain is recorded by _______.
(A) MET
(B) CT
(C) ECG
(D) EEG
Correct Answer : D
Q : Which of the following is an air pollutant?
(A) Sulphur dioxide
(B) Ozone
(C) Water vapour
(D) Nitric oxide
Correct Answer : A Explanation : Answer: A) Sulphur dioxide
Explanation: Air pollutants are solid particles, gases, and liquid droplets in the air that can adversely affect ecosystems and the health of humans.
Major ambient air pollutants include toxic metals, polycyclic aromatic hydrocarbons, benzene, particulate matter (PM), nitrogen oxides, sulfur oxides, carbon monoxide, and ozone. Power plants, factories, and vehicle and air traffic are the most important anthropogenic sources of air pollution.
In addition, natural sources such as wildfires and volcanic activity contribute to ambient air pollution.
Q : Isotopes are atoms of the same element that have different
(A) numbers of neutrons
(B) numbers of electrons
(C) numbers of protons
(D) atomic numbers
Correct Answer : A Explanation : Answer: A) numbers of neutrons
Explanation: Isotopes are variations of an element that have the same charge as the original element, but a different mass, which is caused by either more/less neutrons in the nucleus.
Q : Which of the following statements about water is false?
(A) There is extensive intramolecular hydrogen bonding in the condensed phase.
(B) Water is oxidized to oxygen during photosynthesis.
(C) Ice formed by heavy water sinks in normal water.
(D) Water can act both as an acid and as a base.
Correct Answer : A Explanation : Answer: A) There is extensive intramolecular hydrogen bonding in the condensed phase.
Explanation: Water possess intermolecular hydrogen bonding in the condensed phase.
Hence, the given statement 'There is extensive intramolecular hydrogen bonding in the condensed phase.' about water is FALSE.
Q : Which best describes genetic mutations?
(A) Genetic mutations that cause diseases are always passed on to offspring.
(B) Some inherited genetic mutations can be good for the offspring.
(C) Different genetic mutations cause few forms of cancer.
(D) Somatic mutations can be inherited from parents or acquired during life.
Correct Answer : B Explanation : Answer: B) Some inherited genetic mutations can be good for the offspring.
Explanation: Mutations are accidents in the copying of DNA. A genetic mutation is a random change in the DNA that is passed on further generations of cells and or organisms.
Genetic mutations are accidental changes in the DNA in the germ cells or early in the formation of the embryo. These changes if they are in the germ cell will be passed on to other organisms formed by sexual reproduction or asexual reproduction. An example would be the golden delicious apple. A lost of genetic information due to a mutation resulted in a different color of fruit.
Genetic mutations that cause diseases are not always passed on to offspring.
Q : Which of the following statements is not true about metabolism?
(A) Younger people generally have a slower metabolism than adults.
(B) Basal metabolism is the amount of energy needed for sustaining life.
(C) Basal metabolism is measured by the amount of calories burned when your body is inactive.
(D) Metabolism is influenced by numerous factors, such as heredity and age.
Correct Answer : A Explanation : Answer: A) Younger people generally have a slower metabolism than adults.
Explanation: Metabolism is the set of life-sustaining chemical transformations within the cells of organisms. The three main purposes of metabolism are the conversion of food/fuel to energy to run cellular processes, the conversion of food/fuel to building blocks for proteins, lipids, nucleic acids, and some carbohydrates, and the elimination of nitrogenous wastes.
Younger people have faster metabolism than adults. Hence, the given statement 'Younger people generally have a slower metabolism than adults' is FALSE.