10th Physical Science Bit Bank

1. A solution turns red litmus blue, its pH is likely to be …….
A. 1 B. 4 C. 5 D. 10
2. Colour of methyl orange in alkali conditions?
A. Orange B. Yellow C. Red D. Blue
3. This is used as olfactory indicator ……
A. coloured petals B. onion C. petunia D. litmus
4. Metal oxides are …….
A. basic in nature B. acidic in nature C. neutral in nature D. None of the above
5. The process of dissolving an acid or a base in water is …… process.
A. endothermic B. exothermic C. oxidation D. reduction
6. This salt is mined like coal ……
A. acid salt B. base salt C. neutral salt D. rock salt
7. In pH the letter p stands for …….
A. Potentz B. Potential C. Pre D. Post
8. Pickles are not stored in these vessels ……
A. glass B. plastic C. brass D. ceramic
9. Radius of curvature of a spherical mirror r = ……
A. f B. f/2 C. 2f D. 2f/3
10. …… mirror used in solar cookers.
A. Plane B. Convex C. Concave D. Spherical
11. In car-head lights, the spherical mirrors are in the shape of ……
A. concave B. convex C. ellipsoidal D. parabolic
12. This is a divergent mirror …….
A. concave mirror B. convex mirror C. plane mirror D. parabolic mirror
13. Which of the following can produce a virtual image?
A. concave mirror B. convex mirror C. plane mirror D. All the above

Answers : 1-D 2-B 3-B 4-A 5-B 6-D 7-A 8-C 9-C 10-C 11-D 12-B 13-D

1. The refractive index of glass with respect to air is 2. Then the critical angle of glass – air interface is ……..
a. 0° b. 45° c. 30° d. 60°
2. When a light ray travels from a rarer medium (air) to a denser medium (glass) and if the angle of incidence is i and angle of refraction is r, then …….
a. i > r b. i < r c. i = r d. None of the above 3. This is the coloured part we see in the eye....... a. pupil b. cornea c. eye-lens d. iris 4. The unit of refractive index is ...... a. m/s b. cm/s c. No units d. None of the above 5. Kerosene is optically ....... than water. a. diluted b. denser c. heavier d. rarer 6. The refractive index of benzene is ....... a. 0.15 b. 1.5 c. 1.33 d. 0.133 7. Optical fibres work on the principle of ....... a. reflection b. refraction c. internal reflection d. total internal reflection 8. The refractive index of air increases with.... a. hotness b. humidity c. density d. All the above 9. The incident and emergent rays in the case of glass slab are ........ a. perpendicular b. inclined c. parallel d. coincident 10. Mirage is an example of ..... a. reflection b. refraction c. optical illusion d. optical magic 11. Which one of the materials cannot be used to make a lens? a. water b. glass c. plastic d. clay 12. If f = + 0.5 m for a lens, then its power is ...... a. 0.5 dioptre b. 5 dioptre c. +2 dioptre d. + 1 dioptre 13. We can see ....... image with our eyes. a. virtual b. real c. inverted d. magnified 14. In the case of a concave lens, the image is always formed at ....... a. F b. between F and C c. beyond C d. between P and F 15. A stick held obliquely in water appears bent and short. This is due to the phenomenon of ...... a. reflection b. refraction c. scattering d. dispersion 16. A piece of transparent optical material, having one or two spherical surfaces is called ..... a. prism b. slab c. lens d. None of the above 17. The focal length of a lens depends upon ...... a. size of the object b. surrounding medium c. distance of the object d. nature of the object 18. Rays passing through the focus of a convex lens will take a path ....... to the principal axis after refraction. a. parallel b. perpendicular c. inclined d. None of the above 19. The mid point of a lens is called ..... a. centre of curvature b. focus c. optic centre d. principal axis 20. The value of the focal length of a lens is equal to the value of the image distance when the rays are ........ a. passing through the optic centre b. parallel to the principal axis c. passing through the focus d. in all cases 21. The value of least distance of distinct vision is ...... a. 10 cm b. 15 cm c. 20 cm d. 25 cm 22. During refraction ...... will not change. a. wavelength b. frequency c. speed of light d. All the above 23. When objects at different distances are seen by the eye which of the following remain constant? a. focal length of eye-lens b. object distance from eye-lens c. the radii of curvature of eye-lens d. image distance from eye-lens 24. Near sightedness is called ..... a. Myopia b. Hypermetropia c. Presbyopia d. All the above 25. This colour of light has longest wavelength in the visible spectrum of light ...... a. orange b. red c. violet d. yellow 26. ...... reflection does not obey the laws of reflection. a. regular b. irregular c. partial d. plane 27. If the power of the lens is 2D, then its focal length is ...... a. 100 cm b. 50 cm c. 25 cm d. 75 cm 28. On a hot day the sky appears ....... a. Red b. Yellow c. White d. Blue Answers : 1-c 2-a 3-d 4-c 5-b 6-b 7-d 8-c 9-c 10-c 11-d 12-c 13-a 14-d 15-b 16-c 17-b 18-a 19-c 20-d 21-d 22-b 23-d 24-a 25-b 26-b 27-b 28-c.

SET: 1
1. Hypermetropia can be corrected by using ……. lens.
2. The splitting of white light into different colours is called ……
3. The eyeball is nearly …… in shape.
4. During refraction of light, the character of light which does not change is …….
5. The process of adjusting focal length of eyelens is called ……
6. A good example of dispersion is ……
7. The ray passing through the ……. of the lens is not deviated.
8. All distances are measured from the …… of a convex lens.
9. ……. image cannot be captured on a screen.
10. Convex lens is also called as ……. lens.
11. An air bubble in water behaves like a …… lens.
12. The lens which can form real and virtual images is ………
13. At critical angle of incidence, the angle of refraction is …….
14. Refractive index of air increases with …….
15. The distance between the parallel incident and emergent rays in a glass slab is called ……
16. The refractive index of ice is …….

Answers : 1. biconvex 2. dispersion 3. spherical 4. frequency 5. accommodation 6. rainbow 7. optic centre 8. optic centre 9. virtual 10. converging 11. divergent 12. convex lens 13. 90° 14. density 15. lateral shift 16. 1.31.

SET: II
1. SI unit of Current is ……….
2. …….. are used to make diodes.
3. The effective resistance is less than any individual resistance when resistances are connected in ……..
4. Valence bond theory was proposed by ………
5. ………. bond has no independent existence.
6. Noble gases belong to ………. group.
7. Electrons in ………. shell are called valence electrons.
8. Lithium ………. and Potassium constitute a Dobereiner’s triad.
9. 5f elements are called ……….
10. Atomic radius is measured in ……….
11. Si and Ge are …..
12. Maximum number of electrons that an Mshell contain is/ are …..
13. Cupric chloride produces ….. colour flame.
14. s orbital is ………. in shape.
15. He atom has ….. electrons.
16. The orbitals of equal energy are called …..

Answers : 1. Ampere 2. Semiconductors 3. Parallel 4. Sidgwick & Powell 5. Π bond 6. Zero 7. outermost 8. Sodium 9. Actinides 10. Pm (Picometer) 11. Metalloids 12. 18 13. green 14. spherical 15. two 16. degenerate

SET: III
1. The functional group present in methanol is ……..
2. Fats are ……..
3. The IUPAC name of acetylene is ……..
4. Corrosion of iron occurs in the presence of …….. and ……..
5. Metals at the bottom of the activity series are often found in ……..
6. Electric charges in motion produce ……..
7. An induction stove works on the principle of ……..
8. Electric power is the product of current and …….

Answers : 1. (-OH) alcohol 2. esters of higher fatty acids 3. ethyne 4. air, water 5. free state 6. magnetic field 7. electromagnetic induction 8. emf or voltage.