Dear Aspirants, Here we have given the Important RRB ALP & Technicians Exam 2018 Practice Test Papers. Candidates those who are preparing for RRB ALP 2018 can practice these questions to get more confidence to Crack RRB 2018 Examination.[WpProQuiz 2884]
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1). Which of the following is most ductile metal?
2). Which of the following gas used in Air conditioner?
3). Which of the following lens used in microscope?
- Concave lens
- Objective lens
- Ocular lens
- both b and c
4). Which of the following material refracts the light without focusing?
5). Which of the following metals are not readily reacting with cold water?
6). Mole is the SI unit of _____
- Amount of substance
7). DNA was discovered by ___________
- James D Watson
- Francis Crick
- Both (a) and (b)
8). What is the chemical name of Vitamin C?
- Ascorbic Acid
9). Who proposed the mutation theory of evolution?
- None of these
- William Bateson
- Hugo de Vries
- G J Mendel
10). Which of the following is the Botanical of Wheat?
- d. Musa Paradisiaca
1). Answer: B
In material science, ductility is a solid material’s ability to deform under tensile stress; this is often characterized by the material’s ability to be stretched into a wire.The most ductile metal is platinum while the most malleable is gold.
2). Answer: C
We use Air Conditioning to improve thermal comfort and indoor air quality. So we use “Freon gas” In AC, which is merely a marked name for dichlorodifluoromethane. It adds to ozone depletion and thus the Global warming effects. Because, when the CFC escape from the unit it quickly rises up to the ozone layer.
3). Answer: D
A compound microscope uses multiple lenses to magnify an image for an observer. It is made of two convex lenses: the first, the ocular lens, is close to the eye; the second is the objective lens. Compound microscopes are much larger, heavier and more expensive than simple microscopes because of the multiple lenses.
4). Answer: B
A prism is an optical element. It has polished flat surfaces that refract light. The traditional geometric shape of a prism has a triangular base and two rectangular sides. It is called triangular prism.
A prism can be made from materials like glass, plastic and fluorite. It can be used to split light into its components.
5). Answer: D
Lithium, sodium, potassium, rubidium and caesium are easily reacting with water. It uses these reactions to explore the trend in reactivity in Group 1. All of these metals react vigorously or even explosively with cold water.
6). Answer: D
The mole is the SI base unit for the amount of a substance. It is currently defined by comparison with the number of atoms in 12 g of Carbon-12.
7). Answer: D
Many people believe that American biologist James Watson and English physicist Francis Crick discovered DNA in the 1950.
8). Answer: B
9). Answer: C
Hugo de Vries, who proposed the mutation theory of evolution more than a century ago and that he unknowingly found the importance of polyploidy and chromosomal rearrangements in plant speciation.
10). Answer: C
Triticumsativum is the scientific name of Wheat.