General Science

Organelle other than nucleus, containing DNA is

  1. endoplasmic reticulum
  2. golgi apparatus
  3. mitochondria
  4. lysosome

Cell wall of which one of these is not made up of cellulose?

  1. Bacteria
  2. Hydrilla
  3. Mango tree
  4. Cactus

Amoeba acquires its food through a process, termed

  1. exocytosis
  2. endocytosis
  3. plasmolysis
  4. exocytosis and endocytosis both

The cell organelle involved in forming complex sugars from simple sugars are

  1. endoplasmic reticulum
  2. ribosomes
  3. plastids
  4. golgi apparatus

The undefined nuclear region of prokaryotes are also known as

  1. nucleus
  2. nucleolus
  3. nucleic acid
  4. nucleoid

The proteins and lipids, essential for building the cell membrane, are manufactured by

  1. rough endoplasmic reticulum
  2. golgi apparatus
  3. plasma membrane
  4. mitochondria

Which cell organelle plays a crucial role in detoxifying many poisons and drugs in a cell?

  1. Golgi apparatus
  2. Lysosomes
  3. Smooth endoplasmic reticulum
  4. Vacuoles

Which of the following are covered by a single membrane?

  1. Mitochondria
  2. Vacuole
  3. Lysosome
  4. Plastid

Plasmolysis in a plant cell is defined as

  1. break down (lysis) of plasma membrane in hypotonic medium
  2. shrinkage of cytoplasm in hypertonic medium
  3. shrinkage of nucleoplasm
  4. none of them

Chromosomes are made up of

  1. DNA
  2. protein
  3. DNA and protein
  4. RNA

A cell will swell up if

  1. The concentration of water molecules in the cell is higher than the concentration of water molecules in surrounding medium
  2. The concentration of water molecules in surrounding medium is higher than water molecules concentration in the cell
  3. The concentration of water molecules is same in the cell and in the surrounding medium
  4. Concentration of water molecules does not matter

The first model of an atom was given by

  1. N. Bohr
  2. E. Goldstein
  3. Rutherford
  4. J.J. Thomson

Elements with valency 1 are

  1. always metals
  2. always metalloids
  3. either metals or non-metals
  4. always non-metals

The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion?

  1. 13
  2. 10
  3. 14
  4. 16

In the Thomson’s model of atom, which of the following statements are correct?

  1. the mass of the atom is assumed to be uniformly distributed over the atom
  2. the positive charge is assumed to be uniformly distributed over the atom
  3. the electrons are uniformly distributed in the positively charged sphere
  4. the electrons attract each other to stabilise the atom

Select the correct option:

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

Which of the following statements about Rutherford’s model of atom are correct?

  1. considered the nucleus as positively charged
  2. established that the α–particles are four times as heavy as a hydrogen atom
  3. can be compared to solar system
  4. was in agreement with Thomson’s model

Select the correct option:

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

Dalton’s atomic theory successfully explained

  1. Law of conservation of mass
  2. Law of constant composition
  3.  Law of radioactivity
  4. Law of multiple proportion

Select the correct option:

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

The number of electrons in an element X is 15 and the number of neutrons is 16. Which of the following is the correct representation of the element?

  1. 3115 X
  2. 3116 X
  3. 1615 X
  4. 1516 X

Rutherford’s ‘alpha (α) particles scattering experiment’ resulted in to discovery of

  1. Electron
  2. Proton
  3. Nucleus in the atom
  4. Atomic mass

Which of the following correctly represent the electronic distribution in the Mg atom?

  1. 3, 8, 1
  2. 2, 8, 2
  3. 1, 8, 3
  4. 8, 2, 2

3.42 g of sucrose are dissolved in 18 g of water in a beaker. The number of oxygen atoms in the solution are

  1. 6.68 × 1023
  2. 6.09 × 1022
  3. 6.022 × 1023
  4. 6.022 × 1021

Which of the following correctly represents 360 g of water?

  1. 2 moles of H2O
  2. 20 moles of water
  3. 6.022 × 1023 molecules of water
  4. 1.2044 × 1025 molecules of water

Select the correct option:

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

A mixture of sulphur and carbon disulphide is

  1. heterogeneous and shows Tyndall effect
  2. homogeneous and shows Tyndall effect
  3. heterogeneous and does not show Tyndall effect
  4. homogeneous and does not show Tyndall effect

During summer, water kept in an earthen pot becomes cool because of the phenomenon of

  1. diffusion
  2. transpiration
  3. osmosis
  4. evaporation

Which one of the following sets of phenomena would increase on raising the temperature?

  1. Diffusion, evaporation, compression of gases
  2. Evaporation, compression of gases, solubility
  3. Evaporation, diffusion, expansion of gases
  4. Evaporation, solubility, diffusion, compression of gases

Potable water is the water which is

  1. obtained from a river
  2. obtained from a lake
  3. pure and fit for drinking
  4. used only for washing clothes

Incomplete combustion of fuel such as petrol and diesel gives

  1. nitrogen oxide
  2. sulphur dioxide
  3. carbon monoxide
  4. carbon dioxide

Two mirrors A and B are placed at right angles to each other as shown in Figure.

A ray of light incident on mirror A at an angle of 25° falls on mirror B after reflection. The angle of reflection for the ray reflected from mirror B would be

  1. 25°
  2. 50°
  3. 65°
  4. 115°

A small hole P is made in a piece of cardboard. The hole is illuminated by a torch as shown in Figure. The pencil of light coming out of the hole falls on a mirror.

 

At which point should the eye be placed so that the hole can be seen?

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

Part of the eye which controls the light entering is called

  1. iris
  2. cornea
  3. lens
  4. retina

Ultrasound has frequency of vibration

  1. between 20 and 20,000 Hz
  2. below 20 Hz
  3. above 20,000 Hz
  4. between 500 and 10,000 Hz

Pitch of sound is determined by its

  1. frequency
  2. amplitude
  3. speed
  4. loudness

Loudness of sound is measured in units of

  1. decibel (dB)
  2. hertz (Hz)
  3. metre (m)
  4. metre/second (m/s)

An object is vibrating at 50 hertz. What is its time period?

  1. 0.02 s
  2. 2 s
  3. 0.2 s
  4. 20.0 s

The loudness of sound depends on:

  1. its amplitude
  2. its time period
  3. its frequency
  4. its speed

To sharpen the blade of a knife by rubbing it against a surface, which of the following will be most suitable?

  1. stone
  2. plastic block
  3. wooden block
  4. glass block

During dry weather, while combing hair, sometimes we experience hair flying apart. The force responsible for this is

  1. force of gravity
  2. electrostatic force
  3. force of friction
  4. magnetic force

Structures present in a cell which is responsible for determination of the sex of a baby is

  1. cytoplasm
  2. cell membrane
  3. nucleus
  4. chromosome

In human beings, the correct sequence of events during reproduction is

  1. gamete formation, fertilisation, zygote, embryo
  2. embryo, zygote, fertilisation, gamete formation
  3. fertilisation, gamete formation, embryo, zygote
  4. gamete formation, fertilisation, embryo, zygote

Aquatic animals in which fertilisation occurs in water are said to be:

  1. viviparous without fertilisation
  2. oviparous with external fertilisation
  3. viviparous with internal fertilisation
  4. oviparous with internal fertilisation

Reproduction by budding takes place in

  1. hydra
  2. amoeba
  3. paramecium
  4. bacteria

In humans, the development of fertilised egg takes place in the

  1. ovary
  2. testis
  3. oviduct
  4. uterus

The thread-like structures present in the nucleus are

  1. nucleolus
  2. chromosomes
  3. genes
  4. ribosomes

Which one of the following term is not a part of the nucleus?

  1. ribosome
  2. nucleolus
  3. chromosome
  4. gene

The jelly-like fluid substance present in cells is called

  1. protoplasm
  2. chromosome
  3. chloroplast
  4. cytoplasm

Which one of the following has the highest calorific value?

  1. kerosene
  2. biogas
  3. LPG
  4. petrol

Which of the following reacts with cold water vigorously?

  1. carbon
  2. sodium
  3. magnesium
  4. sulphur

Which of the following non-metals reacts and catches fire on exposure to air?

  1. phosphorus
  2. nitrogen
  3. sulphur
  4. hydrogen

Which of the following is not a metal?

  1. copper
  2. sulphur
  3. aluminium
  4. iron

The material similar to silk in appearance is

  1. Nylon
  2. Rayon
  3. Polyester
  4. Terylene

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