Free Online Science GK

Free Online Science GK
Free Online General Knowledge Preparation Test Science
Free Online Science Gk Practice and Preparation Test

1. The density of ice is x g cm -3 and that of water is y g cm-3. When m gram of ice melts, then change in volume is—
(A) m (y—x)
(B) y—x/m
(C) my (x-.y)
(D) (m/x –m/y)
Ans. (D)

2. The work function of a metallic surface is 5.01 eV. The photoelectrons are emitted when light of wavelength 2000 A falls on it. The stopping potential is—
(A) 2.24V
(B) 1.2V
(C) 2.4 V
(D) 4.8 V
Ans. (B)

3. Chemical behaviour of an element is related to-
(A) Atomic number
(B) Atomic size
(C) Atomic volume
(D) Atomic structure
Ans. (D)

4…………. waves can not be transmitted through vacuum.
(A) Light
(B) Heat
(C) Sound
(D) Electromagnetism
Ans. (C)

5. The geometry of NaCl is—
(A) Triangular
(B) Tetrahedral
(C) Octahedral
(D) Diagonal
Ans. (C)

6. The bond angle in the molecules H2O, NH3, CH4, CO2 are in order—
(A) H2O>NH3>CH4>CO2
(B) H2O (C) H2O < NH3 (D) CH4 Ans. (A)

7. Borax has the formula—
(A) Na2B4O7
(B) Na2B4O75H2O
(C) Na2B4O77H2O
(D) Na2B4O710H2O
Ans. (D)

8. Brass contains—
(A) Cu + Sn
(B) Cu + Ni
(C) Cu + Zn
(D) Mg + Al
Ans. (C)

9. The best technique employed for concentration and purification of a compound is—
(A) Sublimation
(B) Chromatography
(C) Steam Distillation
(D) Fractional Distillation
Ans. (B)

10. Which of the following compounds would undergo cannizaro’s reaction?
(A) Propionaldehyde
(B) Benzaldehyde
(C) Bromobenzene
(D) Acetaldehyde
Ans. (B)

11. Which does not show resonance?
(A) Benzene
(B) Aniline
(C) Ethylamine
(D) Toluene
Ans. (C)

12. The edible part of cauliflower is—
(A) Bud
(B) Flower
(C) Inflorescence
(D) Fruit
Ans. (B)

13. Most of cereals belong to—
(A) Malvacea
(B) Solanacea
(C) Graminea
(D) Leguminosae
Ans. (C)

14. Death of stem and root tips occurs due to the deficiency of—
(A) Phosphorous
(B) Nitrogen
(C) Calcium
(D) Carbon
Ans. (C)

15. Sporophyte of fern produces—
(A) Seeds
(B) Pollen
(C) Spores
(D) None of these
Ans. (C)

16. Duramen or heart wood is—
(A) Outer region of the secondary wood
(B) Inner region of the secondary wood
(C) Region of pericycle
(D) Another name of cambium
Ans. (B)

17. Lichens are the best indicator of—
(A) Air pollution in cities
(B) Water pollution in the hills
(C) Water pollution in the rivers
(D) Soil pollution in the deserts
Ans. (A)

18. Insulin crystals are found in—
(A) Wheat root
(B) Mango root
(C) Dahlia root
(D) Sugarcane root
Ans. (C)

19. The best example of poly-embryony is—
(A) Cocas
(B) Citrus
(C) Capsicum
(D) Cycas
Ans. (D)

20. Which one of the following is an insectivorous plant?
(A) Castor
(B) Hydrilla
(C) Ranunculus
(D) Drosera
Ans. (D)

21. Genetic recombination occurs through—
(A) Mitosis and-fertilization
(B) Mitosis and meiosis
(C) Meiosis division
(D) None of these
Ans. (C)

22. What is an Rh-factor?
(A) A type of sugar
(B) ADNA
(C) An enzyme related
(D) Blood group
Ans. (D)

23. Virus are—
(A) Accellular
(B) Poly-cellular
(C) Mono-cellular
(D) Bi-cellular
Ans. (A)

24. Blood is made of—
(A) Plasma
(B) Lymphocytes
(C) Hemoglobin
(D) None of these
Ans. (A)


25. Ascaris normally inhabits the lumen of—
(A) Stomach
(B) Small intestine
(C) Large intestine
(D) Appendix
Ans. (B)