Hydra has no specialized excretory system because:?
A. It does not produce waste material
B. Due to absence of mesoderm
C. The whole body cells are in contact with water
D. It has pseudocoelom.
Author: BILAL KHATTAK
Main source of energy in Pakistan is :
A.Hydro-electricity
B.Atomic energy
C.Coal energy
D.None of these
Total number of teeth in rabbit is:
A.20
B.24
C.28
D.32
Cenetic information is encoded in the structure of which of these:
A.Enzymes
B.DNA
C.Structure proteins
D.Enzymes and DNA
The area under the load curve represents
A.System voltage
B.Current
C.Energy consumed
D.Maximum demand
E.Average demand
In which case the heat transferred from the air when compressed from 1 ata 15?C to 6 ata would be maximum
A.Adiabatic
B.Isothermal
C.Polytropic pv1.3 = C
D.Polytropic pv1.31 = C
E.Polytropic pv1.35 = C
The adiabatic throttling process of a perfect gas is one of constant
A.kinetic energy
B.enthalpy
C.potential energy
D.pressure
Escalators have the advantage of
A.continuity of motion
B.greater capacity
C.small space requirement
D.all of the above
Rochelle salts are used
A.For colour identification
B.For photography
C.For polarisation
D.As piezoelectric crystals
E.As dectors of gamma rays
