answer
Answer of SET-1
Answer set 1
1.b
Escape velocity of earth is 11.2km/s
2. d
The image of nearer object formed by a long sighted person
is behind the retina. Convex lens is used for remedy.
is behind the retina. Convex lens is used for remedy.
Cause:
- Increase in focal length of eye
- Contraction of eye ball.
Whereas the image of far object formed by a short sighted
person is in front of the retina. Concave lens is used for remedy.
person is in front of the retina. Concave lens is used for remedy.
Cause:
- Decrease in focal length of eye
- Elongation of eye ball.
3. C
Splitting of beam of light is called dispersion.
White light splits into 7 colors .i.e VIBGYOR
Polarization: restricting vibrations of wave in a single
plane.
plane.
Deviation: bending of light when travels from one medium to
another.
another.
4. D
When placed in contact , effective power of system is the
sum of individual power of lenses.
sum of individual power of lenses.
i.e P=P1+P2
Sign should be considered.
5. A
Light year is the unit of distance.
It is the distance travelled by light in a year.
1 light year= 9.460536207×1015 m
6. D
Total heat= 720 calories
Latent heat of fusion=80 calories
It is the heat to convert ice from 0 degree to water at 0 degree
Latent heat of vaporization=540 calories
It is the heat to convert water from 0 degree to vapor at
100 degree
100 degree
Heat required to convert 1gm of water from 1°C to 100°C =
100 calories
100 calories
Total heat =Sum of all these three.
7. D
In projectile,
Acceleration/retardation, total energy remains constant.
Velocity, kinetic energy, momentum decreases until the top
height and in falling down they increase.
height and in falling down they increase.
Potential energy increases with height.
8. A
Weight is more in polar region but mass is same everywhere.
Value of g is more in polar region than equatorial region.
Weight=mg
9. B
1 calorie = 4.2 Joule
1 Joule=1/4.2 calorie
10. A
The field of view is maximum for convex mirror and least for
concave mirror.
concave mirror.
Concave mirrors are used in shaving, ophthalmoscope and
cinema projectors.
cinema projectors.
Convex mirror is used in vehicle.
11. c
Efficiency=MAVR*100%
=6/12*100%
=50%
12. a
For equilibrium of three forces the sum of any of two forces
must be equal to or more than the remaining third force.
must be equal to or more than the remaining third force.
So, only 10N, 12N, 25N set of forces cannot be in equilibrium.
13. a
Intensive property
It doesn't depend upon quantity
e.g. Temperature, Density, Refractive
Index, Specific heat, surface tension, boiling point,
melting point
melting point
Extensive property
It depends upon the quantity.
e.g. Thermal capacity, Pressure, Volume, Mass, free energy
etc.
etc.
14. b
Intensity of sound is more in night due to increase in
density.
density.
carbon dioxide gets concentrated near ground so, density
increases and sound intensity increases.
increases and sound intensity increases.
15. b
Minimum size of mirror to see full image of oneself is Half
of observer
of observer
16. b
Application of total internal reflection:
Mirage
Looming- mirage in cold area
Brilliance of diamond
Optical fiber, endoscopy
Air bubbles appearing silvery white inside water.
Rainbow (due to dispersion as well)
17. b
Protein coat of virus is capsid and it is made up of capsomeres.
Protein coat of virus is capsid and it is made up of capsomeres.
18. a
Small pox is caused by Variola virus.
Other viral diseases
Vericella virus- Chicken Pox
Polio virus- Polio
Rhinovirus- Common cold
Morbillivirus- Measles
HIV- AIDS
COVID 19- corona
19. b
In Meiosis I number of chromosome reduces to half in
daughter cell.
daughter cell.
20. a
Replication of DNA
takes place in Interphase.
takes place in Interphase.
It has 3 sub-phases.
1. Gap one (G1) phase- enzymes and substrate are made ready
synthesis of structural and functional proteins, Ribosomes
mitochondria, chloroplast, lysosome,
mitochondria, chloroplast, lysosome,
golgi-complex etc. occurs
Nucleolus produces r RNA, t RNA and mRNAs
2. Synthesis (S) phase-DNA synthesis phase
DNA replication takes place.
Synthesis of histone protein occurs.
3. Gap two (G2) Phase-
centriole replicates
spindle and aster proteins are formed
Energy storage takes place,
spindle fiber begins to form.
If you feel to ask any questions, leave a comment below. We will try to give answer as soon as possible. Help your friends by sharing the questions with friends.