MCQOPTIONS
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MCQOPTIONS
This section includes 1134 Mcqs, each offering curated multiple-choice questions to sharpen your Grade10 knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
A human hearing can not hear a sound of frequency less than |
| A. | 20 Hz |
| B. | 30 Hz |
| C. | 10 Hz |
| D. | 40 Hz |
| Answer» B. 30 Hz | |
| 202. |
People use the silent whistle to call dogs whose frequency lies between |
| A. | 15,000 Hz to 18,000 Hz |
| B. | 20,000 Hz to 25,000 Hz |
| C. | 10,000 Hz to 15,000 Hz |
| D. | 30,000 Hz to 35,000 Hz |
| Answer» C. 10,000 Hz to 15,000 Hz | |
| 203. |
The technique used to absorb noise by using soft and porous surfaces is called |
| A. | acoustic protection |
| B. | refraction |
| C. | absorption |
| D. | semi lunar protection |
| Answer» B. refraction | |
| 204. |
The sounds which have a jarring and unpleasant effect on our ears is called |
| A. | frequency |
| B. | amplitude |
| C. | noise |
| D. | musical sounds |
| Answer» D. musical sounds | |
| 205. |
The unit of intensity is |
| A. | ms-2 |
| B. | watt |
| C. | Wm-2 |
| D. | Hz |
| Answer» D. Hz | |
| 206. |
We can “see” sound waves by using |
| A. | stethoscope |
| B. | microscope |
| C. | fiberscope |
| D. | oscilloscope |
| Answer» E. | |
| 207. |
The frequency range for ultrasound is |
| A. | 20,000 Hz above |
| B. | less than 20,000 Hz |
| C. | 25,000 Hz |
| D. | less than 20Hz |
| Answer» B. less than 20,000 Hz | |
| 208. |
SONAR ranging is also used to see the object's |
| A. | shape only |
| B. | size only |
| C. | width |
| D. | shape and size |
| Answer» E. | |
| 209. |
Multiple reflections are called |
| A. | reverberations |
| B. | refraction |
| C. | echo |
| D. | compressions |
| Answer» B. refraction | |
| 210. |
The size of the image is always smaller than the object in |
| A. | convex mirror |
| B. | concave mirror |
| C. | silver mirror |
| D. | plane mirror |
| Answer» B. concave mirror | |
| 211. |
The inability of eye to see the objects clearly is called |
| A. | clarity of image |
| B. | Defect of vision |
| C. | blur image |
| D. | small image |
| Answer» C. blur image | |
| 212. |
In astronomical compare to eye piece, objective lens has |
| A. | negative focal length |
| B. | zero focal length |
| C. | small focal length |
| D. | large focal length |
| Answer» E. | |
| 213. |
The power of magnifying glasses given by |
| A. | f + p |
| B. | 1 + d ⁄ f |
| C. | d+ f |
| D. | 1 + fd |
| Answer» C. d+ f | |
| 214. |
If the object is towards the right side of the lens, the object distance will be |
| A. | zero |
| B. | constant |
| C. | positive |
| D. | negative |
| Answer» E. | |
| 215. |
For a diverging lens the focal length is |
| A. | positive |
| B. | negative |
| C. | zero |
| D. | constant |
| Answer» C. zero | |
| 216. |
When a ray of light enters from denser medium to rare medium it bends |
| A. | towards normal |
| B. | away from normal |
| C. | perpendicular to normal |
| D. | parallel to normal |
| Answer» C. perpendicular to normal | |
| 217. |
The power of lens is |
| A. | 1 ⁄ p |
| B. | 1 ⁄ q |
| C. | 1 ⁄ f |
| D. | 1 ⁄ l |
| Answer» D. 1 ⁄ l | |
| 218. |
In human eye, the image is formed |
| A. | behind retina |
| B. | in front of retina |
| C. | on retina |
| D. | in between lens and retina |
| Answer» D. in between lens and retina | |
| 219. |
To describe the change in speed of light in a medium, the term used is called index of |
| A. | reflection |
| B. | refraction |
| C. | diffraction |
| D. | acoustics |
| Answer» C. diffraction | |
| 220. |
One of the angle of a right-angled prism is |
| A. | 30 ° |
| B. | 45 ° |
| C. | 90 ° |
| D. | 60 ° |
| Answer» D. 60 ° | |
| 221. |
A convex mirror is used to reflect light from an object placed 30 cm in front of the mirror. If the focal length of the mirror is 20 cm then the location of the image should be |
| A. | −27 cm |
| B. | −37 cm |
| C. | −29 cm |
| D. | −47 cm |
| Answer» B. −37 cm | |
| 222. |
The critical angle of water when refracted angle is 90° and refractive index for water and air is 1.33 and 1 is |
| A. | 48.8 ° |
| B. | 49.1 ° |
| C. | 50 ° |
| D. | 51 ° |
| Answer» B. 49.1 ° | |
| 223. |
In compound microscope, as compare to eye piece, objective lens has |
| A. | negative focal length |
| B. | zero focal length |
| C. | small focal length |
| D. | large focal length |
| Answer» D. large focal length | |
| 224. |
The projection or converging lens provides |
| A. | inverted image only |
| B. | real image only |
| C. | virtual image |
| D. | inverted and real image |
| Answer» E. | |
| 225. |
The positive charge in an atom was concentrated in a small region called |
| A. | atomic mass |
| B. | electron |
| C. | proton |
| D. | nucleus |
| Answer» E. | |
| 226. |
The age of fossil when C-14: C-12 in bone is one fourth of ratio in bone of living animal and half-life of C-14 is 5732 years is |
| A. | 100 years |
| B. | 11460 years |
| C. | 1000 years |
| D. | 1200 years |
| Answer» C. 1000 years | |
| 227. |
The elements whose atomic number is greater than 82 are naturally |
| A. | unstable nuclei |
| B. | stable nuclei |
| C. | positive nuclei |
| D. | negative nuclei |
| Answer» B. stable nuclei | |
| 228. |
During natural radioactivity the unstable nucleus disintegrates to become more |
| A. | stable |
| B. | unstable |
| C. | excited |
| D. | unexcited |
| Answer» B. unstable | |
| 229. |
Nuclei with atomic number 1 to 82 are |
| A. | stable |
| B. | unstable |
| C. | moderately stable |
| D. | radioactive |
| Answer» B. unstable | |
| 230. |
If the activity of a sample of radioactive bismuth decreases to 1/8 of its original activity in 15 days, then the sample's half-life will be |
| A. | 3 days |
| B. | 10 days |
| C. | 5 days |
| D. | 7 days |
| Answer» D. 7 days | |
| 231. |
In nuclear fission, as compared to the original mass of the heavy nucleus, the total mass of the product is |
| A. | equal |
| B. | more |
| C. | less |
| D. | zero |
| Answer» D. zero | |
| 232. |
What fraction of the original sample will be after 22 years, if the Cobalt-50 is a radioactive element with a half-life of 4.3 years? |
| A. | 1 ⁄ 32 |
| B. | 1 ⁄ 16 |
| C. | 1 ⁄ 8 |
| D. | 1 ⁄ 4 |
| Answer» C. 1 ⁄ 8 | |
| 233. |
In alpha decay (α-decay) the proton number of the parent nuclide |
| A. | increases by 2 |
| B. | increases by 1 |
| C. | decreases by 2 |
| D. | decreases by 4 |
| Answer» D. decreases by 4 | |
| 234. |
The number of protons and neutrons in the nucleus is called |
| A. | neutron number (N) |
| B. | atomic number (Z) |
| C. | atomic mass number (A) |
| D. | electron number (E) |
| Answer» D. electron number (E) | |
| 235. |
[Radius of curvature (R) ⁄ 2] is equal to |
| A. | focal length(f) |
| B. | center of curvature |
| C. | vertex |
| D. | pole |
| Answer» B. center of curvature | |
| 236. |
As the focal length of a concave lens is positive, therefore its power should be |
| A. | also negative |
| B. | always zero |
| C. | positive |
| D. | neutral |
| Answer» B. always zero | |
| 237. |
A point on the principal axis at the center of lens is known as |
| A. | principal axis |
| B. | optical center |
| C. | principal focus |
| D. | focal length |
| Answer» C. principal focus | |
| 238. |
A diverging lens always has the same ray diagram, which forms a |
| A. | curved image |
| B. | large image |
| C. | fat image |
| D. | smaller image |
| Answer» E. | |
| 239. |
The colored portion of the eye that controls the amount of light reaching the retina is known as |
| A. | cornea |
| B. | pupil |
| C. | retina |
| D. | iris |
| Answer» E. | |
| 240. |
The outer concentric shell in fiber optic is called |
| A. | cladding |
| B. | core |
| C. | coat |
| D. | mantle |
| Answer» B. core | |
| 241. |
If an ophthalmologist places a 3.00 diopter lens next to 0.75 diopter lens, the power of lens should be |
| A. | 3 diopters |
| B. | 0.75 diopters |
| C. | 2.25 diopters |
| D. | 3.75 diopters |
| Answer» E. | |
| 242. |
The number of converging lenses that the compound microscope has are |
| A. | 3 |
| B. | 2 |
| C. | 4 |
| D. | 5 |
| Answer» B. 2 | |
| 243. |
After reflection from a concave mirror, rays of light parallel to the principal axis converge to a point which is called |
| A. | pole |
| B. | center of curvature |
| C. | focal length |
| D. | principal focus |
| Answer» E. | |
| 244. |
A medical procedure using any type of endoscope is called |
| A. | ultrasound |
| B. | surgery |
| C. | endoscopy |
| D. | physiotherapy |
| Answer» D. physiotherapy | |
| 245. |
A material whose at least one side is curved is called |
| A. | mirror |
| B. | lens |
| C. | optic fiber |
| D. | prism |
| Answer» C. optic fiber | |
| 246. |
The light rays traveling parallel to the principal axis of a convex lens after refraction meet at a point on the principal axis which is called |
| A. | principal axis |
| B. | optical center |
| C. | principal focus |
| D. | focal length |
| Answer» D. focal length | |
| 247. |
The vertex of spherical mirror lies on |
| A. | center |
| B. | edge |
| C. | lower surface |
| D. | all of above |
| Answer» B. edge | |
| 248. |
The iris has an opening at its center which is called |
| A. | cornea |
| B. | pupil |
| C. | retina |
| D. | chord |
| Answer» C. retina | |
| 249. |
A magnifying glass which is used to produce magnified images of small objects have |
| A. | concave lens |
| B. | convex lens |
| C. | no lens |
| D. | plane mirror |
| Answer» C. no lens | |
| 250. |
If the half-life of the radioactive element is T1/2 then at the end of this time the number of atoms in the sample will become |
| A. | one quarter |
| B. | double |
| C. | half |
| D. | triple |
| Answer» D. triple | |