Four identical planks each of lengths ‘L’ are arranged one above the other over a table as shown. Each projects a distance ‘a’ beyond the edge of the one that is below it. What is the maximum possible value of ‘a’ for the system to be in equilibrium without tripping forward?

1) L / 5
2) L / 4
3) L / 3
4) L

The dihybrid Test Cross ratio is

 (1) 1 : 1
 (2) 1 : 1 : 1 : 1
 (3) 9 : 3 : 3 : 1
 (4) 3 : 1

Which of the following can yield acetylene in one step?

1)  Ethene

2)  Ethylene dichloride

3)  Sodium acetate

4)  Propyne

In ancient day who destroyed the defective babies?
 1) Spartons
 2) Nazi Germans
 3) Australians
 4) Mongolians

One of the following is not an example for prey- Predator food chain:

(1)Mangroves --> Shedleaves --> Detritus--> Shrimps--> Small Fishes--> Large Fishes
(2)Grass--> Grasshopper--> Lizard--> Hawk
(3)Green plants--> Deer--> Tiger
(4)Seeds--> Rhodents--> Snakes--> Mongoose

 Epistatic gene differes from dominant gene in

(1) epistatic gene is nonallelic

(2) epistatic gene never expresses itself independently

(3) epistatic and hypostatic genes are present at different loci

(4) all of these

Which of the following is NOT a nitrogen base of nucleotides present in plasmid DNA?

1) Thymine
2) Cytosine
3) Uracil
4) Adenine

1. Two planets of radii R₁ and R₂ have the same density. The ratio of their accelerations due to gravity at the surface is

1)  (R₂ /R₁)²
2) R₂ /R₁

3) (R₁ /R₂)²
4) R₁ /R₂

 Gene which suppresses other gene’s activity but does not lie on the same locus is called

(1) epistatic                                 (2) supplementary

(3) hypostatic                             (4) condominant

The true sense of equilibrium mammals redsides in internal ear. This is located or the structurre that helps a person to maintain his balance is
1. Malleus
2. Utriculus
3. Eustachian tubes
4. Semicircular canals