Answer of SET 3

Answer of Set 3

1. b
Vector quantities :Acceleration, Current Density, Dipole moment, Displacement, Electric Field, Force, Impulse, Magnetic Dipole Moment, Momentum, Velocity, Weight, Thrust, etc.
Vector= magnitude + direction
All field strength, gradients of scalar are vector.
e.g. magnetic intensity, velocity gradient, etc.


2. a
Scalar quantities: time , volume , speed, mass , temperature , distance, entropy, energy, Temperature, Area, frequency, etc
Scalar= only magnitude no particular direction
All potentials, flux of vectors are scalar.
eg. magnetic flux, gravitational potential, etc


3. c
Tensor quantities: Stress, strain, permeability 
Tensor= magnitude + direction+ area vector


4. d
Dimensionless quantities:
eg. strain, solid angle, coefficient of friction, refractive index, magnification, angle, power factor, phase, reflectance, transmittance, all ratios, etc.


5. b
Conduction is the slowest process of heat transfer.
Radiation> Convection> Conduction


6. d
total power =power by bulb+ power by rod
            =5*200(in watt)*5(in hours)+3*2000(in watt)*3(in hour)
            =1000(in watt)*5(in hours)+6000(in watt)*3(in hour)
            =5kwh+18kwh        (i.e.1000watt=1 kw)
            =23 khw=23 unit


     
7. c
Displacement is shortest distance.
apply Pythagoras theorem to find displacement.
velocity=displacement/time
        =15/5
        =3 m/s


8. c
For third class lever MA is always less than 1.


9. c
Resistance(R),resistivity(ρ),length of wire(l), volume(v), area(A)
R=ρ*l/A
 =ρ*(l*l)/(A*l) (ie multiplying both by l)
 =ρ*(l*l)/v
Since ρ and ρ are constant
R∝(l*l)
Now on calculation we get change in resistance is 21% (increases).




10. b
From above:
R=ρ*l/A
By multiplying numerator and denominator by A we can find out the change.
Since,
R∝1/(A*A)
on calculation we get change in resistance is 21% (decreases)


11. b
Liquid non metal - Bromine


12. c
cation<parent atom<anion


Radius of element can be compared by Z/e ratio where
Z= atomic number
e= number of electrons
Smaller the Z/e ratio, larger the atomic size and vice versa.


13. d
Eka boron = Scandium
Eka silicon = Germanium
Eka aluminium =Gallium
Eka manganese = Technitium


14. b
Nitrogen family- Pnicogens
Oxygen family- Chalcogens
VII A family- Halogens
Inert gases family - Aerogens


15. a
Atomic hydrogen is most reactive form of hydrogen.


16. c
Spinal reflex : Knee jerk
Cerebral reflexes : sneezing, Eye blinking & salivation.
Both cerebral and spinal reflexes: Hunger & cough


17. a
Pneumatic bones are features of Volant adaptation.(eg. Aves)


18. a
Functions of hypothalamus - (SEAT)^2
S-Sexual life, sleeping pattern
E- Emotions, Endocrine glands
A-Apetite, Automatic Nervous system
T-Thirst Temperature


19. c
Reproductive system of parasite is most developed.


20. a
Phototaxis- response to light
Chemotaxis- response to Chemical
Thermotaxis- response to Temperature
Geotaxis- response to  Gravity
Rheotaxis - response to Flow of water
Thigmotaxis- response to touch

Practice set 1- Click here

If you feel to ask any question, leave a comment below. We will try to give answer as soon as possible. Help your friends by sharing the questions with friends.