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Histamine in blood is secreted by:
(1) Mast cells
(2) Macrophages
(3) Eosinophils
(4) Basophils

A person with AB blood group:
(1) Has A and B antigens in his plasma
(2) Lacks any antibodies on RBC surface
(3) Can receive blood transfusion from a person of his own group
(4) Can donate blood to all other group recipients

The inter-atrial septum in the human heart can be best described as:
(1) A thin muscular wall
(2) A thick muscular wall
(3) A thin fibrous tissue
(4) A thick fibrous tissue

The sino-atrial node is the normal pacemaker of the human heart because:
(1) It is located in the right atrium
(2) It is the only part of the conducting system that can generate impulse
(3) It can generate the maximum number of action potentials in the conducting system
(4) The produces action potentials that are more in size than the other parts of the conducting system

What percentage of ventricular filling is achieved by atrial contraction?
(1) 30
(2) 50
(3) 70
(4) 90

The second heart sound during the cardiac cycle is produced by the:
(1) Simultaneous opening of the atrioventricular valyes
(2) Simultaneous closure of the atrioventricular alyes
(3) Simultaneous opening of the semilunarvalve
(4) Simultaneous closure of the semilunar valves

In a surface ECG the QRS complex represents:
(1) Atrial depolarization
(2) Atrial repolarization
(3) Ventricular depolarization
(4) Ventricular repolarization

Normal activities of the human heart are regulated:
(1) Intrinsically
(2) By the autonomic nervous system
(3) By the brain stem
(4) By the diencephalon

Which of the following statements is correct?
(1) Some s-block Hydrides are ionic in nature
(2) When fused states of some s-block Hydrides are electrolysed, hydrogen is evolved    at cathode
(3) Some of the s-block Hydrides, when electrolysed, give hydrogen at anode
(4) All of the above are correct

Which of the following hydrides are covalent in nature:
(1) $Be{H}_2$
(2) NaH
(3) $Ca{H}_2$
(4) None of the above

Which one of the following is the chemical formula of Permutit?
1. ${\mathrm{Na}}_2{\mathrm{Al}}_2{\mathrm{Si}}_2{\mathrm{O}}_8$
2. ${\mathrm{K}}_2{\mathrm{Al}}_2{\mathrm{Si}}_2{\mathrm{O}}_8$
3. ${\mathrm{CaAl}}_2{\mathrm{Si}}_2{\mathrm{O}}_8$
4. ${\mathrm{BeAl}}_2{\mathrm{Si}}_2{\mathrm{O}}_8$

Which one of the following statement is correct?
(1) Ortho hydrogen has same nuclear spin & para hydrogen has opposite nuclear spin
(2) Ortho hydrogen has opposite nuclear spin & para hydrogen has same nuclear spin
(3) Ortho hydrogen is more stable than para hydrogen at room temperature
(4) More than one of the above statements is correct.

Strngth of $H_2{O}_2$ is expressed as 20 volumes. weight of $H_2{O}_2$ (in grams) present in one litre is approximately:
(1) 45 g
(2) 61 g
(3) 23 g
(4) 98 g
 

In the expression $\overrightarrow{\mathrm{F}}=\mathrm{q}\left(\overrightarrow{\mathrm{v}}\times \overrightarrow{\mathrm{B}}\right)$ which pair of vectors are always perpendicular?
1. $\overrightarrow{\mathrm{F}}<mspace\; width="1em"></mspace>\&<mspace\; width="1em"></mspace>\overrightarrow{\mathrm{v}}$
2. $\overrightarrow{\mathrm{F}}<mspace\; width="1em"></mspace>\&<mspace\; width="1em"></mspace>\overrightarrow{\mathrm{B}}$
3.$\overrightarrow{\mathrm{v}}<mspace\; width="1em"></mspace>\&\hspace{0.17em}\overrightarrow{\mathrm{B}}$ 
4. More than one option is correct

A proton, deutron and an alpha-particle have same K.E. enter perpendicular to a magnetic field $\overrightarrow{\mathrm{B}}$. Ratio of radii of circular paths of the three particles ${\mathrm{r}}_{\mathrm{p}}:{\mathrm{r}}_{\mathrm{d}}:{\mathrm{r}}_{\mathrm{\alpha }}$ will be
1. $\sqrt{2}:1\sqrt{2}$
2. $\sqrt{2}:\sqrt{2}:1$
3. $1:\sqrt{2}:1$
4. $1:1:\sqrt{2}$

A charged particle moving with a velocity of $2\hat{\mathrm{i}}-\hat{\mathrm{j}}+3\hat{\mathrm{k}}$ m/s experience a force $\overrightarrow{\mathrm{F}}=\mathrm{a}\hat{\mathrm{i}}+2\hat{\mathrm{j}}-\hat{\mathrm{k}}<mspace\; width="1em"></mspace>\mathrm{N}$ in a uniform magnetic field. Value of 'a' is:
1. 0
2. 2.5
3. 5
4. 8.5

A region enclosed between two plates A & B is of width 1 cm as shown in the figure. Two charges q₁ & q₂ with masses ${\mathrm{m}}_1 (8\times {10}^{-27 }\mathrm{kg})$ & ${\mathrm{m}}_2 (1.6\times {10}^{-26} \mathrm{kg})$ respectively and same kinetic energy 1000 eV are approaching the region. The possible minimum value of magnetic field in the region to ensure none of the two particles touches plate B will be:

1. $\sqrt{2}$
2. $\frac{1}{\sqrt{2}}$
3. $\frac{\sqrt{2}}{3}$
4. All options are correct

A semi-circular wire AB (of radius r) carrying current 'i' is placed in a region with magnetic field $\overrightarrow{\mathrm{B}}$. Force acting on the wire is:

1. 2BiR Up
2. BiR Up
3. 2BiR Down
4. BiR Down