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.
        =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)
 =ρ*(l*l)/(A*l) (ie multiplying both by l)
Since ρ and ρ are constant
Now on calculation we get change in resistance is 21% (increases).

10. b
From above:
By multiplying numerator and denominator by A we can find out the change.
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

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