41. Radioactivity is measured by?
a) Xerox machine
b) odometer
c) Thermoluminescent Dosimeters (TLDs)
d) Geiger counters
42. Which of the following element is fixed by cyanobacteria?
a) Oxygen
b) Nitrogen
c) Sulphur
d) All of these
43. Which of the following is most abundant element in Universe?
a) Oxygen
b) Nitrogen
c) Hydrogen
d) Carbon
44. Radiation Wavelength absorbed by leaf is checked by?
a) Spectrometer
b) Geiger Counter
c) X machine
d) None of these
45. Diopter causes adjustment in which part of microscope?
a) Objective
b) Eyepiece
c) Both A and B
d) None of these
46. Mother of all Science?
a) Physics
b) Chemsitry
c) Mathematics
d) Engineering
47. The mass of a body at the center of the earth is?
a) Greater
b) Lesser
c) Constant
d) Varies
48. One nautical mile is equal to how many kilometers:
a) 1.621km
b) 1.743km
c) 1.853km
d) 1.921km
49. Molten rock beneath the Earth's crust is called:
a) Magma
b) Lava
c) Igneous
d) None of these
50. Package of enzymes bounded by a membrane called a:
a) Ribosomes
b) Golgi apparatus
c) Endoplasmic reticulum
d) Cytoplasm
