Each human kidney has nearly

1. 10,000 nephrons
2. 50,000 nephrons
3. 100,000 nephrons
4. 1 million nephrons

Speeds of two identical cars are u and 4u at a specific instant. The ratio of the respective distances at which the two cars are stopped from that instant is :

1) 1 : 1 2) 1 : 4  3) 1 : 8 4) 1 : 16

 Measures to control plant diseases are
 1. Prophylactic
 2. Therapeutic
 3. Immunization
 4. All the three

Water falls from a height 500m. The rise in temperature of water at bottom if whole of the energy remains in water, will be ( specific heat of water is 4.2 kJ/kg)

1)0.23°C
2) 1.16°C
3)096°C
4)1.02°C

Which one of these does not require external water for fertilisation?

1) Fern
2) Algae
3) Gymnosperms
4) Bryophytes

Mendel's discovery that characteristics are inherited due to the transmission of hereditary factors resulted from his

1. careful microscopic examinations of genes and chromosomes
2. dissections to determine how fertilization occurs in pea plants
3. breeding experiments with many generations of fruit flies
4. analysis of the offspring produced from many pea plant crosses

Study of nuclear cytology is
1. Neurology
2. Rhinology
3. Mycology
4. Karyology

The solubility product of a binary weak electrolyte is  4×10⁻¹⁰ at 298K. Its solubility in mol dm⁻³ at the same temperature is 

1) 4 × 10⁻⁵
2) 2 × 10⁻⁵
3) 8 × 10⁻⁵
4) 16 ×10⁻⁵

The chemical formula of chlorophyll-b is

 (1) C55 H70 O5 N5 Mg
 (2) C₅₅ H₇₀ O₆ N₄ Mg
 (3) C₅₅ H72 O₅ N₄ Mg
 (4) C₅₅ H72 O₅ N₅ Mg

The ease of nitration of the following three hydrocarbons follows the order.

1) II =III =I
2) III > II > I
3) II > III > I
4) I = III > II