If lift is accelerated in the upward direction, then the apparent weight of a body is

(a)

more than true weight

(b)

equal to the true weight

(c)

less than true weight

(d)

not equal to the true weight

The point at which the principal axis meets the surface of the lens is

(a)

centre of curvature

(b)

radius of curvature

(c)

focus

(d)

pole

SI unit of temperature is

(a)

celsius

(b)

fahrenheit

(c)

kelvin

(d)

none

A complete electric circuit is called_____ circuit.

(a)

open

(b)

closed

(c)

complete

(d)

none of these

Sound travels with a velocity of ____________ in dry air

(a)

332 ms^-1

(b)

330 ms^-1

(c)

331 ms^-1

(d)

336 ms^-1

Chain reaction is possible, only if the size of system is __________ the critical size.

(a)

less than

(b)

greater than

(c)

equal to

(d)

independent of

₁₇Cl³⁵, ₁₇Cl³⁷ form the pair of

(a)

Isotope

(b)

Isonar

(c)

Isotone

(d)

Isomer

Modern periodic law is based on __________

(a)

atomic mass

(b)

atomic number

(c)

number of neutrons

(d)

Both (a) and (b)

Which is a non-aqueous solution?

(a)

sugar in water

(b)

common salt in water

(c)

sulphur in carbon disulphide

(d)

None

Pick out a chemical reaction which is not feasible

(a)

2NaCI ⟶ 2Na + Cl₂

(b)

2NaCI + F ⟶ 2NaF + Cl₂

(c)

2NaF + Cl₂ ⟶ 2NaCI + F

(d)

NaOH + HCI ⟶ NaCl + H₂O

Which of the following is formed when soap water acts on clothes to remove dirt or grease?

(a)

acetic acid

(b)

Micelle

(c)

Ethyl alcohol

(d)

all the above

Exarch and tetrarch xylem are a feature of ___________.

(a)

dicot stem

(b)

dicot leaf

(c)

monocot root

(d)

dicot root

The_______ glands are modified glands of the skin

(a)

perineal

(b)

mammary

(c)

gastric

(d)

salivary

Persons with __________ blood group can receive blood from 'AB' group individuals.

(a)

'A' only

(b)

B only

(c)

AB and O

(d)

A, B, AB and O

The ______ has a role in sleep cycle.

(a)

cerebrum

(b)

spinal cord

(c)

pons

(d)

hypothalamus

_____ is found in the chloroplast of plants.

(a)

Auxin

(b)

Abscisic Acid

(c)

Ethylene

(d)

Cytokinin

After fertilization the _________disintegrates.

(a)

Ovule

(b)

Polar nuclei

(c)

Antipodals

(d)

Endosperm

Franklin and Wilkin were awarded nobel prize for_______.

(a)

studying DNA replication

(b)

studying about RNA

(c)

X - ray diffraction studies of DNA.

(d)

isolating DNA

The Big Bang theory explains the ________

(a)

Origin of Universe

(b)

Origin of sea

(c)

Origin of mountain

(d)

Origin of water

An organism having more than two sets of chromosomes is called

(a)

Diploid

(b)

Haploid

(c)

Monoploid

(d)

Polyploid

Obesity is not a risk factor for ___________

(a)

AIDS

(b)

diabetes

(c)

arthritis

(d)

CHD

There are______ biosphere reserves in India.

(a)

5

(b)

13

(c)

15

(d)

18

Windows and LINUX are examples of________

(a)

Files

(b)

Folders

(c)

Operating Systems

(d)

Programs

If 25 N of force is used to compress a spring, then how much reactive force exerted by spring?

Write the application of convex lenses.

Why will a watermelon stay cool for a longer time than sandwiches when both are removed from a cooler on a hot day?

Find the effective resistance of series connection of parallel resistors.

What is time period of sound wave?

Write the two factors which lead to loss of neutrons.

What is gram molecular mass?

Answer the following questions with respect to periods of the modern periodic table.
(i) Longest period
(ii) Shortest period
(iii) Number of elements in 1^st period
(iv) Elements of period 1
(v) Number of elements in period 4

Find the concentration of solution in terms of weight percent if 20g of sugar is dissolved in 40g of water

Powdered CaCO₃ reacts much faster with HCI than with solid marble chips. Account for the following

What are hard and soft soap?

What is starch sheath?

Explain respiratory system of a rabbit.

Define Osmosis.

When we touch a cactus unknowingly, we get pricked by the thorns. We withdraw our hands immediately. Which type of neuron gets activated first.

What would happen if the parathyroid gland was removed?

Mention the significance of fertilization?

Differentiate diploid and haploid condition.

What is Geologic time scale.

List the objective of animals breeding?

Define drug addiction.

What is the need to look for non conventional energy sources?

If you are an artist, which computer applications will be relevant for you?

Derive the Relation between g and G?

Explain the types of Telescope.

Define and describe thermal expansion.

Water boils in an electric kettle in 15 mins after switching on. If the length of the heating wire is decreased to \(\frac{1}{3}\) of its initial value, then in how much time will the same amount of water boil with the same supply voltage?

What are the various possibilities of relative motion between source and listener?

Distinguish between Nuclear fission and nuclear fusion.

How will you determine the atomicity of gases using Avogadro's hypothesis?

Explain the variation of electronegativity down a group and across a period.

Write some solubility substances in water at 25°C.

Explain the classification based on the direction of the reaction.

What are the advantages of detergents over soaps?

Explain the role of sunlight in photosynthesis.

Is hirudin used in medical science.

List the difference between RBC and WBC.

Rani fell from her bike and had a head injury. She was hospitalized and discharged later. What do you think she could have done to save herself from this accident.

Describe the role of pancreas in maintenance of blood sugar level.

Write a note on agents of pollination.

Write a note on DNA replication.

Write a note on evidences from Morphology and Anatomy in favour of Evolution.

Write a note an DNA fingerprinting.

Explain the hazards and effects of Tobacco.

What are the solutions suggested for disposal of e-wastes for companies / Organizations?

Explain in detail the uses and main parts of the 'SCRATCH' animation software.

The masses of two planets are in the ratio 1 : 2 their radii are in the ratio 1 : 2. Find the ratio of the acceleration due to gravity on the planets.

The far position of a myopic person is 90 cm in front of the eye. What is the nature and power of the lens required to correct the problem?

If boiling point of water is 95°F, What will be the reading in kelvin scale?

Find the
(i) equivalent resistance,
(ii) current through each reactor,
(iii) Total current for the given circuit,
(iv) Voltage drop across each resistor.

An observer approaches a stationary sound source 1000 Hz at twice the speed of sound. What frequency does the observer hear?

If Gadolinium - 150 undergoes through a - decay what is the new atomic mass of the resulting element?

Find the mass of 2.5 mole of oxygen atom.