MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Age of a tree can be estimated by : |
| A. | Its height and girth |
| B. | Biomass |
| C. | Number of annual rings |
| D. | Diameter of its heartwood |
| Answer» D. Diameter of its heartwood | |
| 2. |
Lenticels are involved in |
| A. | Transpiration |
| B. | Gaseous exchange |
| C. | Food transport |
| D. | Photosynthesis |
| Answer» C. Food transport | |
| 3. |
In china rose the flowers are : |
| A. | Actinomorphic, hypogynous with twisted aestivation |
| B. | Actinomorphic, epigynous with valvate aestivation |
| C. | Zygomorphic, hypogynous with imbricate aestivation |
| D. | Zygomorphic, epigynous with twisted aestivation |
| Answer» B. Actinomorphic, epigynous with valvate aestivation | |
| 4. |
Interfascicular cambium develops from the cells of : |
| A. | Medullary rays |
| B. | Xylem parenchyma |
| C. | Endodermis |
| D. | Pericycle |
| Answer» B. Xylem parenchyma | |
| 5. |
Which enzyme/s will be produced in a cell in which there is a non-sense mutation in the lac Y gene ? |
| A. | b-galactosidase |
| B. | Lactose permease |
| C. | Transacetylase |
| D. | Lactose permease and transacetylase |
| Answer» B. Lactose permease | |
| 6. |
According to Darwin, the organic evolution is due to - |
| A. | Intraspecific competition |
| B. | Interspecific competition |
| C. | Competition within closely related species |
| D. | Reduced feeding efficiency in one species due to the presence of interfering species. |
| Answer» C. Competition within closely related species | |
| 7. |
The eye of octopus and eye of cat show different patterns of structure, yet they perform similar function, This is an example of : |
| A. | Homologous organs that have evolved due to convergent evolutio |
| B. | Homologous organs that have evolved due to divergent evolution |
| C. | Analogous organs that have evolved due to convergent evolution |
| D. | Analogous organs that have evolved due to divergent evolution |
| Answer» D. Analogous organs that have evolved due to divergent evolution | |
| 8. |
Infection of Ascaris usually occurs by : |
| A. | drinking water containing eggs of Ascaris |
| B. | eating imperfectly cooked pork |
| C. | Tse-tse fly |
| D. | mosquito bite |
| Answer» B. eating imperfectly cooked pork | |
| 9. |
The cell-mediated immunity inside the human body is carried out by : |
| A. | T- lymphocytes |
| B. | B-lymphocytes |
| C. | Thrombocytes |
| D. | Erythrocytes |
| Answer» B. B-lymphocytes | |
| 10. |
In plant breeding programmes, the entire collection (of plants/seeds) having all the diverse alleles for all genes in a given crop is called : |
| A. | selection of superior recombinants |
| B. | cross-hybridisation among the selected parents |
| C. | evaluation and selection of parents |
| D. | germplasm collection |
| Answer» E. | |
| 11. |
During sewage treatment, biogases are produced which include : |
| A. | methane, hydrogensulphide, carbon dioxide |
| B. | methane, oxygen, hydrogensulphide |
| C. | hydrogensulphide, methane, sulphur dioxide |
| D. | hydrogensulphide, nitrogen, methane |
| Answer» B. methane, oxygen, hydrogensulphide | |
| 12. |
A biologist studied the population of rats in a barn, He found that the average natality was 250, average mortality 240, immigration 20 and emigration 30. The net increase in population is : |
| A. | 10 |
| B. | 15 |
| C. | 5 |
| D. | zero |
| Answer» E. | |
| 13. |
The Air Prevention and control of pollution Act came into force in : |
| A. | 1975 |
| B. | 1981 |
| C. | 1985 |
| D. | 1990 |
| Answer» C. 1985 | |
| 14. |
Global warming can be controlled by : |
| A. | Reducing deforestation, cutting down use of fossil fuel |
| B. | Reducing reforestation, increasing the use of fossil fuel |
| C. | Increasing deforestation, slowing down the growth of human population |
| D. | Increasing deforestation, reducing efficiency of energy usage |
| Answer» B. Reducing reforestation, increasing the use of fossil fuel | |
| 15. |
A sedentary sea anemone gets attached to the shell lining of hermit crab. The association is : |
| A. | Ectoparasitism |
| B. | Symbiosis |
| C. | Commensalism |
| D. | Amensalism |
| Answer» C. Commensalism | |
| 16. |
Which one of the following processes during decomposition is correctly described ? |
| A. | Fragmentation –Carried out by organisms such as earthworm |
| B. | Humification – Leads to the accumulation of a dark coloured substance humus which undergoes microbial action at a very fast rate |
| C. | Catabolism – Last step in the decomposition under fully anaerobic condition |
| D. | Leaching – Water soluble inorganic nutrients rise to the top layers of soil |
| Answer» B. Humification – Leads to the accumulation of a dark coloured substance humus which undergoes microbial action at a very fast rate | |
| 17. |
An excess of AgNO3 is added to 100 mL of a 0.01 M solution of dichlorotetraaquachrominum (III) chloride. The number of moles of AgCl precipitated would be |
| A. | 0.001 |
| B. | 0.002 |
| C. | 0.003 |
| D. | 0.01 |
| Answer» B. 0.002 | |
| 18. |
Dipole - induced dipole interactions are present in which of the following pairs : |
| A. | H2O and alcohol |
| B. | Cl2 and CCl4 |
| C. | HCl and He atoms |
| D. | SiF4 and He atoms |
| Answer» D. SiF4 and He atoms | |
| 19. |
Maximum deviation from ideal gas is expected from : |
| A. | H2(g) |
| B. | N2(g) |
| C. | CH4(g) |
| D. | NH3(g) |
| Answer» E. | |
| 20. |
How many grams of concentrated nitric acid solution should be used to prepare 250 mL of 2.0 M HNO3 ? The concentrated acid is 70 % HNO3. |
| A. | 45.0 g conc. HNO3 |
| B. | 90.0 g conc. HNO3 |
| C. | 70.0 conc. HNO3 |
| D. | 54.0 g conc. HNO3 |
| Answer» B. 90.0 g conc. HNO3 | |
| 21. |
A hydrogen gas electrode is made by dipping platinum wire in a solution of HCl of pH = 10 and by passing hydrogen gas around the platinum wire at one atm pressure. The oxidation potential of electrode would be ? |
| A. | 0.059 V |
| B. | 0.59 V |
| C. | 0.118 V |
| D. | 1.18 V |
| Answer» C. 0.118 V | |
| 22. |
What is the maximum numbers of electrons that can be associated with the following set of quantum numbers ? n = 3, l = 1 and m = –1. |
| A. | 10 |
| B. | 6 |
| C. | 4 |
| D. | 2 |
| Answer» E. | |
| 23. |
In a n-type semiconductor, which of the following statements is true - |
| A. | Electrons are majority carriers and trivalent atoms are dopants |
| B. | Electrons are minority carriers and pentavalent atoms are dopants |
| C. | Holes are minority carriers and pentavalent atoms are dopants |
| D. | Holes are majority carriers and trivalent atoms are dopants |
| Answer» D. Holes are majority carriers and trivalent atoms are dopants | |
| 24. |
A parallel beam of fast moving electrons is incident normally on a narrow slit. A fluorescent screen is placed at a large distance from the slit. If the speed of the electrons is increased, which of the following statements is correct ? |
| A. | Diffraction pattern is not observed on the screen in the case of electrons |
| B. | The angular width of the central maximum of the diffraction pattern will increase |
| C. | The angular width of the central maximum will decrease |
| D. | The angular width of the central maximum will be unaffected |
| Answer» D. The angular width of the central maximum will be unaffected | |
| 25. |
The half-life of a radioactive isotope ‘X’ is 20 years. It decays to another element ‘Y’ which is stable. The two elements ‘X’ and ‘Y’ were found to be in the ratio 1 : 7 in a sample of a given rock. The age of the rock is estimated to be - |
| A. | 40 years |
| B. | 60 years |
| C. | 80 years |
| D. | 100 years |
| Answer» C. 80 years | |
| 26. |
A coil of self-inductance L is connected in series with a bulb B and an AC source. Brightness of the bulb decreases when - |
| A. | frequency of the AC source is decreased |
| B. | number of turns in the coil is reduced |
| C. | a capacitance of reactance XC = XL is included in the same circuit |
| D. | an iron rod is inserted in the coil |
| Answer» E. | |
| 27. |
A current loop in a magnetic field - |
| A. | experiences a torque whether the field is uniform or non-uniform in all orientations |
| B. | can be in equilibrium in one orientation |
| C. | can be in equilibrium in two orientations, both the equilibrium states are unstable |
| D. | can be in equilibrium in two orientations, one stable while the other is unstable |
| Answer» E. | |
| 28. |
The resistances of the four arms P, Q, R and S in a Wheatstone’s bridge are 10 ohm, 30 ohm, 30 ohm and 90 ohm, respectively. The e.m.f. and internal resistance of the cell are 7 volt and 5 ohm respectively. If the galvanometer resistance is 50 ohm, the current drawn from the cell will be - |
| A. | 1.0 A |
| B. | 0.2 A |
| C. | 0.1 A |
| D. | 2.0 A |
| Answer» C. 0.1 A | |
| 29. |
A source of unknown frequency gives 4 beats/s, when sounded with a source of known frequency 250 Hz. The second harmonic of the source of unknown frequency gives five beats per second, when sounded with a source of frequency 513 Hz. The unknown frequency is - |
| A. | 254 Hz |
| B. | 246 Hz |
| C. | 240 Hz |
| D. | 260 Hz |
| Answer» B. 246 Hz | |
| 30. |
For a normal eye, the cornea of eye provides a converging power of 40D and the least converging power of the eye lens behind the cornea is 20D. Using this information, the distance between the retina and the cornea- eye lens can be estimated to be - |
| A. | 5 cm |
| B. | 2.5 cm |
| C. | 1.67 cm |
| D. | 1.5 cm |
| Answer» D. 1.5 cm | |
| 31. |
The condition under which a microwave oven heats up a food item containing water molecules most efficiently is - |
| A. | The frequency of the microwaves must match the resonant frequency of water molecules |
| B. | The frequency of the microwaves has no relation with natural frequency of water molecules |
| C. | Microwaves are heat waves, so always produce heating |
| D. | Infra-red waves produce heating in a microwave oven |
| Answer» B. The frequency of the microwaves has no relation with natural frequency of water molecules | |
| 32. |
A wire loop is rotated in a magnetic field. The frequency of change of direction of the induced e.m.f. is - |
| A. | once per revolution |
| B. | twice per revolution |
| C. | four times per revolution |
| D. | six times per revolution |
| Answer» C. four times per revolution | |
| 33. |
A source of unknown frequency gives 4 beats/s, when sounded with a source of known frequency 250 Hz. The second harmonic of the source of unknown frequency gives five beats per second, when sounded with a source of frequency 513 Hz. The unknown frequency is - |
| A. | 254 Hz |
| B. | 246 Hz |
| C. | 240 Hz |
| D. | 260 Hz |
| Answer» B. 246 Hz | |
| 34. |
It we study the vibration of a pipe open at both ends, then the following statement is not true - |
| A. | Open end will be antinode |
| B. | Odd harmonics of the fundamental frequency will be generated |
| C. | All harmonics of the fundamental frequency will be generated |
| D. | Pressure change will be maximum at both ends |
| Answer» E. | |
| 35. |
The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied ? |
| A. | length = 50 cm, diameter = 0.5 mm |
| B. | length = 100 cm, diameter = 1 mm |
| C. | length = 200 cm, diameter = 2 mm |
| D. | length = 300 cm, diameter = 3 mm |
| Answer» B. length = 100 cm, diameter = 1 mm | |