answer
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
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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
