Q1. The solar cooker works on the same principle as
(A) Bolometer (B) Pyrometer
(C) Greenhouse (D) Galvanometer
- Solar cookers must be placed out of the wind and solar ovens and cookers will not work at night.
- Isolating the inside of the cooker from the air outside makes an important difference. A plastic or glass cover creates a greenhouse effect, which ensures that the retained heat does not escape. — #Link
Q2. Hydraulic press is based on
(A) Archimedes’ law (B) Pascal’s law
(C) Reynold’s law (D) Bernouli law
- A hydraulic press works on the principle of Pascal’s law, which states that when pressure is applied to a confined fluid, the pressure change occurs throughout the entire fluid. Within the hydraulic press, there is a piston that works as a pump, that provides a modest mechanical force to a small area of the sample. — #Link
Q3. LED stands for
(A) Light emitting device (B) Light emitting diode
(C) light encapsulated device (D) light emitting dots
- An LED is what’s called a “solid-state lighting” technology, or SSL. Basically, instead of emitting light from a vacuum (as in an incandescent bulb) or a gas (as in a CFL), an SSL emits light from a piece of solid matter. In the case of a traditional LED, that piece of matter is a semiconductor. — #Link
Q4. At what temperature, Celcius and Fahrenheit readings will be same ?
(A) + 40° (B) + 20° (C) – 20° (D) – 40°
Q5. Mg2+ is isoelectronic with
(A) Ca2+ (B) Na+ (C) Zn2+ (D) Cu+
- An Isoelectronic Series is a group of atoms/ions that have the same number of electrons.
N3-, O2-, F–, Ne, Na+, Mg2+, Al3+ This series each have 10 electrons.
P3-, S2-, Cl–, Ar, K+, Ca2+, Sc3+ This series each have 18 electrons. — #Link
Q6. Hybridization of C2 and C3 of
(A) sp sp3 (B) sp2 sp (C) sp2 sp2 (D) sp sp
Q7. The compound that can not be kept is glass vessel because it reacts with glass is
(A) HNO3 (B) HCl (C) HF (D) HBr
- Hydrofluoric acid etches glass, due to the strong bond formed between fluoride anions and the silicon molecules in glass. HF will also react with glazes, enamels, pottery, concrete, rubber, leather, many metals (especially cast iron).
- Both anhydrous hydrofluoric acid and aqueous solutions are clear, colorless, and highly corrosive liquids. — #Link
Q8. How many grams of NaOH are needed to make 100ml. of a 0.5 M solution of NaOH ? (Atomic weight : Na = 23, 0 = 16, H = l)
(A) 2 (B) 20 (C) 4 (D) 1
- Molarity = [(Weight of solute)/ molecular weight) * (1000/ Volume)]
- 0.5 = [(Weight of Solute)/ (23+16+1) * (1000/100)]
- 0.5 = [(Weight of solute)/ 40) * 10]
- 0.5 = [Weight of solute / 4]
- Weight of solute = 2
Q9. Chemically Aspirin is :
(A) Acetyl salicylic acid (B) Sodium salicylate
(C) Methyl salicylate (D) Ethyl salicylate
- Aspirin, also known as acetylsalicylic acid, is a medication used to reduce pain, fever, or inflammation. — #Wiki
Q10. Transfer of pollen from anther to the stigma of the same flower is referred to as
(A) Allogamy (B) Geitenogamy (C) Xenogamy (D) Autogamy
- Anther –> The part of the stamen where pollen is produced.
- The process by which pollen grains are transferred from anthers to stigma is referred as pollination. Pollination is of two types: viz. 1) Autogamy or self pollination and 2) Allogamy or cross pollination.
- Transfer of pollen grains from the anther to the stigma of same flower is known as autogamy or self pollination. Autogamy is the closest form of inbreeding. Autogamy leads to homozygosity.
- Transfer of pollen grains from the anther of one plant to the stigma of another plant is called allogamy or cross pollination. This is the common form of out-breeding. Allogamy leads to heterozygosity. — #Link
Q11. The Pyrimidine bases in a DNA are :
(A) Adenine and Guanine (B) Thymine and Adenine
(C) Cytosine and Guanine (D) Thymine and Sytosine
Q12. Which one of the following is the natural auxin ?
(A) NAA (B) IAA (C) 2, 4-D (D) IBA
Q13. During cell division, DNA synthesis takes place in
(A) Interphase (B) Anaphase (C) Prophase (D) Telophase
- DNA synthesis means DNA replication.
- Modes of Cell Division
- Prophase (longest phase)
- Phases of Cell Cycle
- Interphase (nondividing phase, covers more than 95% of total duration)
- M phase/ Mitosis phase (dividing phase)
Q14. One turn of DNA helix measures
(A) 34A° (B) 3.4A° (C) 24A° (D) 44A°
- Watson and Crick published their analysis of DNA structure in 1953 (The Watson–Crick Model).
- Two of the features of that model are that
- The bases of both chains are flat structures lying perpendicular to the axis; they are “stacked” on one another, 3.4 Å (0.34 nm) apart, on the inside of the double helix.
- Each complete turn of the helix is 34 Å (3.4 nm) long; thus, each turn of the helix is the length of a series of 10 base pairs. — #Link
Q15. In monohybrid cross of Mendel, when a pure tall plant was crossed with a dwarf plant, all the F1 progeny were tall, because of:
(A) Co-dominance (B) Dominance
(C) Incomplete dominance (D) Epistasis
- Gregor Mendel used monohybrid crosses to identify dominant and recessive traits in his landmark experiments with peas.
- Breeding a long-stemmed pea plant with a short-stemmed pea plant creates offspring that all have a heterozygous genotype (Ll). As long stems are dominant, all offspring will have the long-stemmed phenotype. — #Link
- — #Link2
Q16. Phenotypic ratio of Mendelian Dihybrid cross is
(A) 9 : 3 : 3 : 1 (B) 1 : 1 : 1 : 1 (C) 3 : 4 : 3 : 1 (D) 1 : 2 : 1 : 1
Q17. Cerebral Malaria is caused by
(A) Plasmodium vivax (B) Plasmodium malariae
(C) Plasmodium falciparum (D) None of the above
- A protozoan parasite; deadliest species of Plasmodium; transmitted by female anopheles mosquito. — #Wiki
Q18. “Natural Selection” is the theory from
(A) G. J. Mendel (B) Charles Darwin
(C) T. H. Morgan (D) None of the above
- The theory of natural selection was explored by 19th-century English naturalist Charles Darwin. Natural selection explains how genetic traits of a species may change over time. This may lead to speciation, the formation of a distinct new species. — #Link
Q19. Cranial nerve in mammals are
(A) 10 pairs (B) 10 (C) 12 pairs (D) 12
- The brain of reptiles, birds, and mammals is connected to twelve pairs of cranial nerves. Out of these spinal accessory and hypoglossal (XI and XII) are’ not present in fishes. Following is a table of cranial nerves of a mammal with their branches. — #Link
Q20. ‘Tasar’ silk fibre is produced by
(A) Antheraea mylitta (B) Bombyx mori
(C) Philosomia ricini (D) Antheraea assamensis
- Tasar (Tussah) is copperish colour, coarse silk mainly used for furnishings and interiors.
- Tasar silk is generated by the silkworm, Antheraea mylitta which mainly thrive on the food plants Asan and Arjun.
- Five major types of silk of commercial importance:
- Tasar —> Antheraea mylitta
- Mulberry ( most of the commercial silk) —> Bombyx mori L
- Oak Tasar (finer variety of tasar) —> Antheraea proyeli J
- Eri —> Philosamia ricini (domesticated)
- Muga (golden yellow colour silk, pride of Assam) —> Antheraea assamensis (semi-domesticated) — #Link
Q21. Satellites provide information about
(A) Forest and vegetative cover (B) Rivers and their courses
(C) Advancing storms and cyclones (D) All of the above