Mock Test: विज्ञान (भाग-IV)

Two ends of rods of length L and radius R of the same material are kept at same temperature. Which of the following rods conducts the maximum heat?

A

L = 25 cm, R = 0.5 cm

B

L = 50 cm, R = 1.0 cm

C

L = 75 cm, R = 1.5 cm

D

L = 100 cm, R = 2.0 cm

A ball thrown up is caught by the thrower 6 sec after start. The height to which the ball has risen is: (take g = 10 m/s²)

A

30 m

B

45 m

C

60 m

D

90 m

Which of the following is not a xerophytic adaptation to reduce transpiration?

A

Stems take over the function of photosynthesis

B

Presence of hairs in stomatal pits

C

Presence of keratin layer on the leaf surface

D

Presence of waxy coating on leaf surface

If a body loses half of its velocity on penetrating 3 cm in a wooden block, then how much will it penetrate more before coming to rest (in cm)?

A

1

B

2

C

3

D

1.5

Which of the following statement is wrong?

A

Histones are rich in lysine and arginine

B

The pH of histones is less than 7

C

An octamer of histones is present in nucleosome

D

Five types of histones are involved in DNA packaging

The welding of railway tracks was done in the past with the aid of chemical reaction known as the thermite process. The thermite reaction involves the displacement of a metal from its solid oxides by another metal. Which of the following equations could represent the thermite reaction?

A

MgO + Zn → Mg + ZnO

B

2Fe + Al₂O₃ → Fe₂O₃ + 2Al

C

3Zn + Al₂O₃ → 3ZnO + 2Al

D

2Al + Fe₂O₃ → Al₂O₃ + 2Fe

Which of the following is not a member of Kingdom Monera?

A

Blue green algae

B

Bacteria

C

Slime moulds

D

Methanogens

Select the essential parts of a flower using the codes given below: A. Petals B. Pistil C. Peduncle D. Stamens E. Sepals

A

A and E

B

A and C

C

B and D

D

C and D

A person of mass 60 kg is standing on a spring balance inside a lift. If the lift falls freely downwards, then the reading of the spring balance will be equal to:

A

equal to 60 kg

B

more than 60 kg

C

less than 60 kg

D

zero

Which of the following statements are incorrect about the structure of an atom? (i) The atom as a whole is neutral. (ii) The atom is an indivisible particle. (iii) The whole mass of an atom is concentrated in the nucleus. (iv) All the atoms are stable in their basic state.

A

(ii) and (iii)

B

(iii) and (iv)

C

(ii) and (iv)

D

(i) and (iv)

Which one of the following statement is totally wrong about the occurrence of notochord, while the other three are correct?

A

It is present only in the tail of ascidian larva

B

It is replaced by a vertebral column in adult toad

C

It is not persistent throughout life in chondrichthyes

D

It persists throughout life in Amphioxus and extends from head to tail

In a tape recorder, while connecting six cells in a battery in series by mistake one cell is connected with reverse polarity. If the effective resistance of load is 24 Ω and internal resistance of each cell is 1 Ω and e.m.f. 1.5 V, the current delivered by the battery is:

A

0.1 A

B

0.2 A

C

0.3 A

D

0.4 A

An electric current is flowing through a circular coil of radius R. The ratio of the magnetic field at the centre of the coil and that at a distance √3 R from the centre of the coil on its axis is:

A

2 : 1

B

5 : 3

C

8 : 1

D

3 : 2

In an accident in a school lab, a large sample of aqueous sodium hydroxide was split. Which substance when added in excess, is not suitable for neutralizing the alkali spill?

A

Sulphuric acid

B

Oxalic acid

C

Citric acid

D

Sodium hydrogen sulphate

The displacement time graph for the two particles P₁ and P₂ are straight lines inclined at 30° and 45° with the time axis. The ratio of velocities V₁ : V₂ will be:

A

1 : √3

B

√3 : 1

C

1 : 3

D

1 : 1

Which oxides of Nitrogen are generated by burning of fossil fuel?

A

NO and NO₂

B

NO₂, NO₃ and N₂O₅

C

N₂O₃ and N₂O₅

D

NO₃ and N₂O₅

An atom with 3 protons and 4 neutrons will have a valency of:

A

7

B

1

C

3

D

4

A moving coil galvanometer of resistance 50 Ω gives a full scale deflection, when a current of 0.5 mA is passed through it. The resistance required to convert it into a voltmeter of range 10 volt, is:

A

1950 Ω

B

2000 Ω

C

19950 Ω

D

20000 Ω

A simple pendulum has a time period T₁, when it is on earth's surface and T₂, when taken to a height R above the earth's surface. Where R is the radius of the earth. The value of T₂/T₁ will be:

A

1

B

√2

C

2

D

4

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

A

Evaporation, solubility, compression of gases

B

Evaporation, diffusion, expansion of gases

C

Diffusion, solubility, compression of gases

D

Condensation, diffusion, compression of gases

When crystals of lead nitrate are heated strongly in a dry test tube:

A

a brown residue is left

B

white fumes appear in the tube

C

crystals immediately vaporise

D

a yellow residue is left

Which of the following set can be used for the denaturation of ethyl alcohol?

A

Methanol, Water, Copper Chloride

B

Propanol, Vinegar, Potassium Permanganate

C

Methanol, Pyridine, Copper Sulphate

D

Vinegar, Pyridine, Water

Select wrong statement from the following:

A

Iron necessary for human body is abundantly found in green vegetables

B

Zinc is one of the essential trace elements required for human body

C

Fat and minerals are not the essential nutrients for a balanced diet of humans

D

The food that generate energy in the body after complete oxidation are in the form of carbohydrates, fat and proteins

In which of the following conditions, the distance between the molecules of hydrogen gas would increase, filled in a container? (i) Some hydrogen gas leaking out the container. (ii) Increasing the volume of container of hydrogen gas. (iii) Increasing pressure on hydrogen gas contained in a closed container. (iv) Adding more hydrogen gas to container without increasing the volume of the container.

A

(ii) and (iii)

B

(ii) and (iv)

C

(i) and (ii)

D

(i) and (iii)

The initial number of atoms of a radioactive element with half life 100 days, is 9.6 × 10²⁶. The number of atoms remaining undecayed after 500 days, will be:

A

19.2 × 10²⁵

B

9.6 × 10²⁵

C

3.84 × 10²⁵

D

3.0 × 10²⁵

Intercalary meristems are the primary meristems, because: I. They appear early in the life of a plant. II. They contribute to the formation of the primary plant body.

A

Both I and II are correct

B

Both I and II are incorrect

C

Only I is correct

D

Only II is correct

Which of the following does not form an acidic salt?

A

Phosphoric acid

B

Sulphuric acid

C

Hydrochloric acid

D

Nitric acid

What will be the pressure on a swimmer 10 m below the surface of a lake?

A

1 atm

B

2 atm

C

5 atm

D

10 atm

Nature of calcium phosphate present in tooth enamel is:

A

acidic

B

neutral

C

basic

D

amphoteric

The endothelium of blood vessels is:

A

Squamous epithelium

B

Cuboidal epithelium

C

Columnar epithelium

D

Ciliated epithelium

Beats are heard due to interference of two sound waves. The intensity of sound changes from maximum to minimum in 100 milli second. The difference in frequencies of two waves is:

A

No difference

B

2.5 Hz

C

5.0 Hz

D

10.0 Hz

Select the incorrect pair of the food articles and the plant part from which it is obtained from the following:

A

Wheat - Fruit

B

Ginger - Root

C

Turmeric - Stem

D

Tea - Leaves

Consider the following statements in reference to green manure and select the incorrect statement using the codes given below: (A) Green manure is rich in organic matter and nutrients. (B) Green manure is primarily used to enrich the soil in phosphorus. (C) Green manure is the undecomposed plant material.

A

A and B

B

B and C

C

C and A

D

Only B

Which of the following are also considered to be the states of matter? (i) Plasma (ii) Platelets (iii) BEC (iv) BHC

A

(i) and (ii)

B

(iii) and (iv)

C

(i) and (iii)

D

(ii) and (iii)

Cells that maintain marrow cells are called:

A

Osteocytes

B

Chondrocytes

C

Osteoclast

D

Marrowclast

A plant with genotype WWXxYyZZ is self pollinated. What proportion of the progeny will show the genotype WWxxyyZZ (if all four genes are independently assorting):

A

1/9

B

1/16

C

1/64

D

1/128

Match the Column-I with Column-II and choose the correct option: Column-I: I. X-Rays, II. Visible light, III. Ultraviolet radiation, IV. Infrared radiation; Column-II: A. Ahmedabad, B. Calcutta, C. Delhi, D. Mumbai

A

I(A), II(C), III(B), IV(D)

B

I(A), II(B), III(C), IV(D)

C

I(D), II(C), III(B), IV(A)

D

I(B), II(D), III(A), IV(C)

The earth's part responsible for causing earthquakes is:

A

crust of earth

B

mantle of earth

C

inner core of earth

D

outer core of earth

Examine Assertion (A) and Reason (R) and choose correct answer: Assertion (A): Species are static units in classification. Reason (R): Species do not change with time.

A

A and R are true and R is the correct explanation of A

B

A and R are true but R is not correct explanation of A

C

A is true but R is false

D

A and R are false

Which of the following living cells have perforations on their cell walls?

A

Bast cells

B

Vessels

C

Tracheids

D

Sieve cells

A transparent cube contains a small air bubble. Its apparent distance is 2 cm when seen through one face and 5 cm when seen through other face. If the refractive index of the material of the cube is 1.5, the real length of the edge of cube must be:

A

14 cm

B

7/3 cm

C

7.5 cm

D

10.5 cm

Which of the following statements are incorrect for carbon compounds? a. Most carbon compounds are good conductor of electricity. b. Most carbon compounds have ionic bonds. c. Force of attraction between molecules of carbon compounds is not very strong. d. Methanol, acetic acid and acetone are carbon compounds.

A

(a) and (d)

B

(c) and (d)

C

(a) and (b)

D

(b) and (d)

Select wrong statement:

A

The storage of energy at consumer level is known as secondary productivity

B

In any ecosystem maximum energy is stored at producer level

C

Ecosystem term was coined by Odum

D

Rate at which organic molecules are formed in an autotroph is called gross primary productivity

Which one of the following is wrongly matched?

A

Tendon - Connective tissue

B

Smooth muscles - Involuntary muscle

C

Red muscles - Myoglobin

D

Troponin - Fibrous protein

Dalton's atomic theory successfully explained: (i) Law of conservation of mass (ii) Law of constant proportion (iii) Law of radioactivity (iv) Law of multiple proportion

A

(i), (iii) and (iv)

B

(ii), (iii) and (iv)

C

(i), (ii) and (iv)

D

(i), (ii) and (iii)

Which of the following metals is present in the anode mud during electrolytic refining of copper?

A

Aluminium

B

Gold

C

Sodium

D

Zinc

Which of the following crop is not suitable for loamy soil?

A

Wheat

B

Paddy

C

Pulses

D

Cotton

The element which is not common between the compounds called baking soda and soda ash is?

A

Hydrogen

B

Oxygen

C

Sodium

D

Carbon

Which of the following equation does not represent a simple harmonic motion?

A

y = a sin ωt + b cos ωt

B

y = ae^(iωt)

C

y = b cos ωt

D

y = b tan ωt

Which of the Planet has the largest number of satellites?

A

Jupiter

B

Mars

C

Mercury

D

Saturn

A torque of 50 Nm acting on a wheel at rest rotate it through 200 radians in 5 seconds. The angular acceleration (in rad/sec²) will be:

A

4

B

8

C

12

D

16

Microscopic aquatic organisms lacking locomotory ability and drifting with water currents are:

A

Pleuston

B

Plankton

C

Necton

D

Seston

A very thin transparent film of soap bubble (thickness → 0) is seen under reflection of white light. Then the colour of the film appear to be:

A

Blue

B

Black

C

White

D

Yellow

Which of the following property does not describe a compound?

A

It cannot be separated into its constituents by physical means

B

It is composed of two or more elements

C

It is a pure substance

D

It is mixed in any proportion by mass

Two chemical substances X and Y combine together to form a product P which contains both X and Y: X + Y → P. X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following statements concerning X, Y and P are correct? (i) P is a compound (ii) X and Y are compounds (iii) X and Y are elements (iv) P has a fixed composition

A

(i), (ii) and (iii)

B

(i), (ii) and (iv)

C

(ii), (iii) and (iv)

D

(i), (iii) and (iv)

Which of the following is not chiefly a Rabi crop?

A

Groundnut

B

Gram

C

Pea

D

Mustard

The evaporation of water increases under the following conditions:

A

Increase in temperature, addition of common salt

B

Increase in surface area, rise in temperature

C

Increase in surface area, decrease in temperature

D

Decrease in surface area, decrease in pressure

In fluid mosaic model of plasma membrane:

A

Upper layer is non-polar and hydrophilic

B

Polar layer is hydrophobic

C

Phospholipids form a bilayer that provides fluidity

D

Proteins form a middle layer

Which of the following process/processes release heat? (i) Condensation (ii) Vaporisation (iii) Freezing (iv) Melting

A

Only (i)

B

Only (iv)

C

(ii) and (iii)

D

(i) and (iii)

Which of the following would weigh the highest?

A

0.2 mole of sucrose (C₁₂H₂₂O₁₁)

B

2.0 moles of CaCO₃

C

2.0 moles of CO₂

D

10 moles of H₂O