Mock Test: Science Subject (Part-IV)

A 200 N block rests on a frictionless inclined plane of angle of inclination 30°. A cord attached to the block passes over a frictionless pulley at the top of the plane is attached to a second block. If the system is in equilibrium, then the weight of second block (in N) approximately is:

A

100

B

86.6

C

173

D

115.5

The process in which a mixture of heavier particles and lighter particles are separated by the wind, is:

A

Threshing

B

Winnowing

C

Sieving

D

Sedimentation

2.5 g of sugar is dissolved in 47.5 g of water. What is its concentration as percent by mass?

A

5.26%

B

5.0%

C

19.0%

D

50.0%

Which of the following contains maximum number of molecules?

A

1 g CO2

B

1 g N2

C

1 g H2

D

1 g CH4

Which of the following statement is incorrectly matched?

A

A metal used in joining electric wires – Magnesium

B

A metal whose oxide is soluble in both acids and bases – Zinc

C

A metal unreactive towards oxygen and dilute acids – Gold

D

A metal extracted by using electrolytic reduction – Aluminium

Which type of joint is found between the bones of the skull?

A

Hinge joint

B

Pivot joint

C

Fibrous joint

D

Cartilaginous joint

Consider the following statements: (i) Any dc-generator can also function as a simple dc-motor. (ii) The induced electromotive force produced in an AC Generator reverses direction twice per period. Choose the correct option:

A

Only (i) is correct.

B

Only (ii) is correct.

C

Both (i) and (ii) are incorrect.

D

Both (i) and (ii) are correct.

Which of the following is not the causative organism for Ringworm?

A

Microsporum

B

Trichophyton

C

Epidermophyton

D

Macrosporum

The atomic mass of an element is determined by the number of .........

A

Protons

B

Electrons

C

Neutrons

D

Nucleons

An ionic compound of element X and chlorine has formula MCl3. The molecular mass of MCl3 is 118.5. What will be the molecular mass of oxide of element X?

A

28

B

44

C

72

D

99

A 45 kW motor winds a cable around a drum while lifting a 2700 kg mass to a height of 6 m in 3 sec. The power lost to the friction (in kW) is: (take g = 10 m/s2)

A

5.0

B

0.5

C

0.8

D

6.6

The hormone responsible for ovulation is:

A

Estrogen

B

Progesterone

C

Luteinizing Hormone (LH)

D

Follicle-Stimulating Hormone (FSH)

An insect trapped in a circular groove with a radius of 12 cm continuously moves along the groove and complete 7 revolutions in 100 s. Regarding the motion of the insect, consider the following statements: (i) The linear speed is 5.3 cm/s. (ii) Acceleration is not a constant vector. (iii) The magnitude of acceleration is constant 2.3 cm/s2. Choose the correct option:

A

Only (i) and (ii) are correct.

B

Only (ii) and (iii) are correct.

C

Only (i) and (iii) are correct.

D

All (i), (ii) and (iii) are correct.

An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be:

A

100 W

B

75 W

C

50 W

D

25 W

A balloon operates at an altitude where the air density is 0.90 kg/m3. At this altitude, the balloon has a volume of 20 m3 and is filled with helium (ρHe = 0.178 kg/m3). If the weight of the balloon bag is 88 N, the load (in N) it can support at this level is:

A

34.9

B

176

C

53.1

D

141.9

In which part of the nephron does glucose reabsorption take place?

A

Glomerulus

B

Bowman's capsule

C

Proximal convoluted tubule

D

Loop of Henle

Ram measures the period of oscillation of a simple pendulum. In successive measurements, the reading are 2.63 s, 2.56 s, 2.42 s, 2.71 s and 2.80 s. The mean absolute error and percentage error are respectively:

A

0.11 s and 4%

B

0.068 s and 4%

C

0.068 s and 2.6%

D

0.11 s and 2.6%

For the following reasons, Nichrome wire is generally used as a heating element in heating appliances: (i) Its melting point is high. (ii) Its resistivity is high. (iii) It does get oxidized easily. Choose the correct option:

A

Only (i) and (ii) are correct.

B

Only (i) and (iii) are correct.

C

Only (ii) and (iii) are correct.

D

All (i), (ii) and (iii) are incorrect.

What does 'bioprospecting' refer to?

A

Exploring biological diversity for new commercial products

B

Conservation of endangered species

C

Genetic engineering of plants

D

Studying ecological systems

A 50 N sled rests on a horizontal surface. A horizontal pull of 10 N is required just to start the sled moving. After motion is started, only a 5 N force is needed to move the sled with a constant velocity. The coefficient of static and kinetic friction are respectively:

A

0.10, 0.20

B

0.20, 0.10

C

0.10, 0.15

D

0.15, 0.20

The region of the vertebrate eye, from where the optic nerve passes out of the retina, is called the:

A

Fovea

B

Iris

C

Blind spot

D

Optic chiasma

A uniform ring of mass 'm' is lying at a distance √3R from the center of the sphere of mass 'M' just over the sphere (where 'R' is the radius of the ring as well as of the sphere), then the magnitude of the gravitational force between them is:

A

√3 GMm / R²

B

√3 GMm / 8R²

C

GMm / 8R²

D

GMm / 2R²

'Jaya' and 'Ratna' are varieties of:

A

Wheat

B

Maize

C

Cow-pea

D

Rice

Choose the dispersed phase, dispersion medium and type of colloid, respectively in milk of magnesia:

A

Liquid, Solid, Gel

B

Solid, Liquid, Sol

C

Liquid, Liquid, Emulsion

D

Gas, Liquid, Foam

A long solenoid has 500 turns per meter and a cross sectional area 4 cm². The current in its winding is increasing at 100 A/s. The magnitude of the induced electric field within the loop, if its radius is 2 cm, is:

A

1 × 10⁻⁴ V/m

B

2 × 10⁻⁴ V/m

C

4 × 10⁻⁴ V/m

D

0.5 × 10⁻⁴ V/m

Match Column–I with Column–II and select the correct answer from the given code:

A

A-(iv), B-(ii), C-(i), D-(iii)

B

A-(ii), B-(iii), C-(iv), D-(i)

C

A-(ii), B-(iv), C-(iii), D-(i)

D

A-(i), B-(ii), C-(iv), D-(iii)

A magnetron in a microwave oven emits electromagnetic wave with frequency f = 2450 MHz. The magnitude of the magnetic field required for electron to move in circular path with this frequency is:

A

0.0438 T

B

0.0270 T

C

0.0877 T

D

0.05415 T

When lead nitrate is heated in glass tube: (i) A double decomposition reaction takes place. (ii) Brown fumes of NO₂ are evolved. (iii) White residue is left behind in the glass tube. Out of (i), (ii) and (iii) which statement(s) is/are correct?

A

(i) and (iii) Only

B

(ii) and (iii) Only

C

(ii) Only

D

(i) and (ii) Only

Mucor is associated with:

A

Phycomycetes

B

Ascomycetes

C

Basidiomycetes

D

Deuteromycetes

From the given option choose the one that does not belong to the group based on solubility:

A

Milk

B

Honey

C

Oil

D

Ink

The middle zone of a candle flame is also called the zone of ................. combustion.

A

Spontaneous

B

Rapid

C

Complete

D

Partial

Name the method which is based on fact that ovulation and therefore the cycle do not occur during the period of intense lactation following parturition:

A

Periodic abstinence

B

Coitus interruptus

C

Intra Uterine Devices (IUDs)

D

Lactational amenorrhoea

Which of the following is not correctly matched?

A

Methanogens : Archaeacteria

B

Nostoc : Eubacteria

C

Euglenoids : Protista

D

Sporozoans : Fungi

Which one is not an crystalline allotrope of carbon?

A

Coal

B

Graphite

C

Diamond

D

Fullerene

Solder is an alloy of:

A

Pb and Sn

B

Cu and Sn

C

Cu and Zn

D

Pb and Zn

Which of the following condition is most favourable for converting gas into liquid?

A

High pressure, low temperature

B

Low pressure, low temperature

C

Low pressure, high temperature

D

High pressure, high temperature

Which of the following substance is not applied on the head of a matchstick made up of a suitable wood?

A

Antimony trisulphide

B

Potassium chlorate

C

Starch

D

Red phosphorus

Which of the following fuel has the highest calorific value?

A

Petrol

B

LPG

C

CNG

D

Hydrogen

Vijay is unable to focus on objects closer than 2.5 m from his eyes. Approximately what refractive power should his corrective lens have?

A

2.8 D

B

3.6 D

C

3.2 D

D

2.5 D

Which of the following statement is incorrect about state of matter?

A

The force of attraction between gas molecules is very less.

B

Plasma consist of super energetic and super excited particles.

C

The plasma glows with a special colour depending on the nature of the gas.

D

Bose-Einstein condensate is formed by heating of gas of extremely low density.

A wave of frequency 500 Hz has a phase velocity of 360 m/s. The phase difference between two displacements at a certain point at a time 10⁻³ sec apart is:

A

2π

B

π/2

C

π/3

D

π

Which of the following is not caused by the atmospheric refraction of light?

A

Twinkling of stars at night.

B

Sun appearing higher in the sky than it actually is.

C

Sun becoming visible two minutes before actual sunrise.

D

Sun appearing red at sunset.

Out of the following relation, which is not a solution of the one-dimensional wave equation?

A

y = x² + v²t²

B

y = x² – v²t²

C

y = (x + vt)²

D

y = (x – vt)²

Which of the following is not correctly matched?

A

Himgiri : Stripe rust resistance

B

Pusa Swarnim : Aphids resistance

C

Pusa Gaurav : Aphids resistance

D

Pusa Komal : Bacterial blight

Which of the following is used in manufacturing of steel?

A

Coke

B

Coal gas

C

Coaltar

D

Bitumen

The average force required to stop a bullet of mass 16 g moving at a speed of 260 m/s, when it penetrates a block of wood to a distance of 12 cm, is:

A

-9020 N

B

-4510 N

C

9020 N

D

4510 N

What happens during the G1 phase of the cell cycle?

A

DNA is synthesized.

B

The cell grows in size and prepares for DNA replication.

C

Chromosomes align at the metaphase plate.

D

The cell divides.

Choose the incorrect statement:

A

Methane and CO₂ are green house gases.

B

Dobson units measure noise in environment.

C

Montreal Protocol is associated with ozone layer depletion.

D

Use of incinerators is crucial to disposal of hospital waste.

Sequoia (the giant redwood tree), one of the tallest tree species, is associated with:

A

Pteridophytes

B

Tree fern

C

Gymnosperms

D

Angiosperms

A voltmeter with a resistance of 1800 Ω can be used to measure the potential difference across a 200 Ω resistor. Equivalent resistance of circuit will be:

A

180 Ω

B

140 Ω

C

160 Ω

D

100 Ω

The characteristic texture of 'Swiss Cheese' is due to:

A

Lactobacillus

B

Saccharomyces

C

Propionibacterium

D

Penicillium

Which of the following is involved in the modification, sorting and packaging of proteins?

A

Ribosomes

B

Endoplasmic reticulum

C

Golgi apparatus

D

Lysosomes

For refraction at a concave spherical surface (separating glass-air medium), the distance of the object should be greater than 'z' times the radius of curvature of the refracting surface for the image to be real, the value of 'z' is:

A

2

B

3/2

C

2/3

D

3

Which substance is used to prevent rusting of iron in galvanisation process?

A

Aluminium

B

Zinc

C

Copper

D

Magnesium

For an object to seen sharply, the image must be formed exactly at the location of the ............

A

Cornea

B

Sclera

C

Retina

D

Optic nerve

Which of the following is not a characteristic feature of all living organisms?

A

Metabolism

B

Growth

C

Reproduction

D

Photosynthesis

Match the substances given in Column–I which are useful in the treatment of those, given in Column–II:

A

A-(iii), B-(iv), C-(ii), D-(i)

B

A-(ii), B-(i), C-(iii), D-(iv)

C

A-(ii), B-(iii), C-(i), D-(iv)

D

A-(iii), B-(i), C-(ii), D-(iv)

What is the primary role of the Smooth Endoplasmic Reticulum (SER)?

A

Protein synthesis

B

Lipid synthesis

C

Photosynthesis

D

ATP synthesis

Which of the following is type of sedimentary cycle?

A

Nitrogen, Carbon

B

Nitrogen, Sulphur

C

Sulphur, Phosphorus

D

Phosphorus, Carbon

Select the primary consumer from their food chain. (choose the most appropriate option):

A

Zooplankton, Grasshopper, Cow

B

Birds, Fishes, Wolf

C

Phytoplankton, Grass, Trees

D

Man, Lion, Vulture