General Science

GB Reproduction Heredity

In Rhizopus, tubular thread-like structures bearing sporangia at their tips are called

  1. filaments
  2. hyphae
  3. rhizoids
  4. roots

GB Reproduction Heredity

In Spirogyra, asexual reproduction takes place by

  1. breaking up of filaments into smaller bits
  2. division of a cell into two cells
  3. division of a cell into many cells
  4. formation of young cells from older cells

GB Reproduction Heredity

Characters transmitted from parents to offspring are present in

  1. cytoplasm
  2. ribosome
  3. golgi bodies
  4. genes

GB Reproduction Heredity

Which of the following is the correct sequence of events of sexual reproduction in a flower?

  1. pollination, fertilisation, seedling, embryo
  2. seedling, embryo, fertilisation, pollination
  3. pollination, fertilisation, embryo, seedling
  4. embryo, seedling, pollination, fertilisation

GB Reproduction Heredity

In a flower, the parts that produce male and female gametes (germ cells) are

  1. stamen and anther
  2. filament and stigma
  3. anther and ovary
  4. stamen and style

GB Life Processes

The growth of pollen tubes towards ovules is due to

  1. hydrotropism
  2. chemotropism
  3. geotropism
  4. phototropism

GB Life Processes

The growth of tendril in pea plants is due to

  1. effect of light
  2. effect of gravity
  3. rapid cell divisions in tendrillar cells that are away from the support
  4. rapid cell divisions in tendrillar cells in contact with the support

GB Life Processes

The shape of guard cells changes due to change in the

  1. protein composition of cells
  2. temperature of cells
  3. amount of water in cells
  4. position of nucleus in the cells

GB Life Processes

Iodine is necessary for the synthesis of which hormone?

  1. Adrenaline
  2. Thyroxin
  3. Auxin
  4. Insulin

GB Life Processes

The main function of abscisic acid in plants is to

  1. increase the length of cells
  2. promote cell division
  3. inhibit growth
  4. promote growth of stem

GB Life Processes

The movement of shoot towards light is

  1. geotropism
  2. hydrotropism
  3. chemotropism
  4. phototropism

GB Life Processes

Spinal cord originates from

  1. cerebrum
  2. medulla
  3. pons
  4. cerebellum

GB Life Processes

Posture and balance of the body is controlled by

  1. cerebrum
  2. cerebellum
  3. medulla
  4. pons

GB Life Processes

Which is the correct sequence of the components of a reflex arc?

  1. Receptors→ Muscles→ Sensory neuron→ Motor neuron→ Spinal cord
  2. Receptors→ Motor neuron → Spinal cord → Sensory neuron → Muscle
  3. Receptors → Spinal cord → Sensory neuron → Motor neuron → Muscle
  4. Receptors → Sensory neuron → Spinal cord → Motor neuron → Muscle

GB Life Processes

In a neuron, conversion of electrical signal to a chemical signal occurs at/in

  1. cell body
  2. axonal end
  3. dendritic end
  4. axon

GB Life Processes

In a synapse, chemical signal is transmitted from

  1. dendritic end of one neuron to axonal end of another neuron
  2. axon to cell body of the same neuron
  3. cell body to axonal end of the same neuron
  4. axonal end of one neuron to dendritic end of another neuron

GB Life Processes

Electrical impulse travels in a neuron from

  1. Dendrite → axon → axonal end → cell body
  2. Cell body → dendrite → axon → axonal end
  3. Dendrite → cell body → axon → axonal end
  4. Axonal end → axon → cell body → dendrite

GB Life Processes

Choose the correct path of urine in our body

  1. kidney → ureter → urethra → urinary bladder
  2. kidney → urinary bladder → urethra → ureter
  3. kidney → ureters → urinary bladder → urethra
  4. urinary bladder → kidney → ureter → urethra

GB Life Processes

Which is the first enzyme to mix with food in the digestive tract?

  1. Pepsin
  2. Cellulase
  3. Amylase
  4. Trypsin

GB Life Processes

The opening and closing of the stomatal pore depends upon

  1. oxygen
  2. temperature
  3. water in guard cells
  4. concentration of CO2 in stomata

GB Life Processes

The blood leaving the tissues becomes richer in

  1. carbon dioxide
  2. water
  3. heamoglobin
  4. oxygen

GB Life Processes

The filtration units of kidneys are called

  1. ureter
  2. urethra
  3. neurons
  4. nephrons

GB Life Processes

What prevents backflow of blood inside the heart during contraction?

  1. Valves in heart
  2. Thick muscular walls of ventricles
  3. Thin walls of atria
  4. All of the above

GB Life Processes

During respiration exchange of gases take place in

  1. trachea and larynx
  2. alveoli of lungs
  3. alveoli and throat
  4. throat and larynx

GB Life Processes

Which is the correct sequence of air passage during inhalation?

  1. Nostrils → larynx → pharynx → trachea → lungs
  2. Nasal passage → trachea → pharynx → larynx → alveoli
  3. larynx → nostrils → pharynx → lungs
  4. Nostrils → pharynx → larynx → trachea → alveoli

GB Life Processes

In which part of the alimentary canal food is finally digested?

  1. Stomach
  2. Mouth cavity
  3. Large intestine
  4. Small intestine

GB Life Processes

Which part of alimentary canal receives bile from the liver?

  1. Stomach
  2. Small intestine
  3. Large intestine
  4. Oesophagus

GB Life Processes

The inner lining of stomach is protected by one of the following from hydrochloric acid. Choose the correct one

  1. Pepsin
  2. Mucus
  3. Salivary amylase
  4. Bile

GB Life Processes

In which of the following groups of organisms, food material is broken down outside the body and absorbed?

  1. Mushroom, green plants, Amoeba
  2. Yeast, mushroom, bread mould
  3. Paramecium, Amoeba, Cuscuta
  4. Cuscuta, lice, tapeworm

GB Life Processes

Which is the correct sequence of parts in human alimentary canal?

  1. Mouth → stomach → small intestine → oesophagus → large intestine
  2. Mouth → oesophagus → stomach → large intestine → small intestine
  3. Mouth → stomach → oesophagus → small intestine → large intestine
  4. Mouth → oesophagus → stomach → small intestine → large intestine

GC Periodic Classification

Which one of the following does not increase while moving down the group of the periodic table?

  1. Atomic radius
  2. Metallic character
  3. Valence
  4. Number of shells in an element

GC Periodic Classification

Arrange the following elements in the order of their increasing nonmetallic character
Li, O, C, Be, F

  1. F < O < C < Be < Li
  2. Li < Be < C < O < F
  3. F < O < C < Be < Li
  4. F < O < Be < C < Li

GC Periodic Classification

Arrange the following elements in the order of their decreasing metallic character
Na, Si, Cl, Mg, Al

  1. Cl > Si > Al > Mg > Na
  2. Na > Mg > Al > Si > Cl
  3. Na > Al > Mg > Cl > Si
  4. Al > Na> Si > Ca > Mg

GC Periodic Classification

Which of the following gives the correct increasing order of the atomic radii of O, F and N?

  1. O, F, N
  2. N, F, O
  3. O, N, F
  4. F, O, N

GC Periodic Classification

Which one of the following elements exhibit maximum number of valence electrons?

  1. Na
  2. Al
  3. Si
  4. P

GC Periodic Classification

The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 respectively. Which pair of elements belong to the same group?

  1. A and B
  2. B and D
  3. A and C
  4. D and E

GC Periodic Classification

According to Mendeleev's Periodic Law, the elements were arranged in the periodic table in the order of

  1. increasing atomic number
  2. decreasing atomic number
  3. increasing atomic masses
  4. decreasing atomic masses

GC Periodic Classification

Upto which element, the Law of Octaves was found to be applicable

  1. Oxygen
  2. Calcium
  3. Cobalt
  4. Potassium

GC Carbon Compounds

Mineral acids are stronger acids than carboxylic acids because

  1. mineral acids are completely ionised
  2. carboxylic acids are completely ionised
  3. mineral acids are partially ionised
  4. carboxylic acids are partially ionised

Select the correct option:

  1. (i) and (iv)
  2. (ii) and (iii)
  3. (i) and (ii)
  4. (iii) and (iv)

GC Carbon Compounds

Vinegar is a solution of

  1. 50% – 60% acetic acid in alcohol
  2. 5% – 8% acetic acid in alcohol
  3. 5% – 8% acetic acid in water
  4. 50% – 60% acetic acid in water

GC Carbon Compounds

Chlorine reacts with saturated hydrocarbons at room temperature in the

  1. absence of sunlight
  2. presence of sunlight
  3. presence of water
  4. presence of hydrochloric acid

GC Carbon Compounds

In the following reaction, alkaline KMnO4 acts as:

 

  1. Reducing agent
  2. Oxidising agent
  3. Catalyst
  4. Dehydrating agent

GC Carbon Compounds

Which of the following are correct structural isomers of butane?

 

  1. (i) and (iii)
  2. (ii) and (iv)
  3. (i) and (ii)
  4. (iii) and (iv)

GC Carbon Compounds

Buckminsterfullerene is an allotropic form of

  1. phosphorus
  2. sulphur
  3. carbon
  4. tin

GC Metals Non-Metals

Which among the following alloys contain mercury as one of its constituents?

  1. Stainless steel
  2. Alnico
  3. Solder
  4. Zinc amalgam

GC Metals Non-Metals

An element A is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in air. It reacts vigorously with water. Identify the element from the following 

  1. Mg
  2. Na
  3. P
  4. Ca

GC Metals Non-Metals

2 mL each of concentrated HCl, HNO3 and a mixture of concentrated HCl and concentrated HNO3 in the ratio of 3 : 1 were taken in test tubes labelled as A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B but the metal got dissolved in test tube C respectively. The metal could be

  1. Al
  2. Au
  3. Cu
  4. Pt

GC Metals Non-Metals

If copper is kept open in air, it slowly loses its shining brown surface and gains a green coating. It is due to the formation of

  1. CuSO4
  2. CuCO3
  3. Cu(NO3)2
  4. CuO

GC Metals Non-Metals

Stainless steel is very useful material for our life. In stainless steel, iron is mixed with

  1. Ni and Cr
  2. Cu and Cr
  3. Ni and Cu
  4. Cu and Au

GC Metals Non-Metals

Galvanisation is a method of protecting iron from rusting by coating with a thin layer of

  1. Gallium
  2. Aluminium
  3. Zinc
  4. Silver