If the Earth shrinks to 50% of its real radius its mass remaining the same, the weight of a body on the Earth will

(a)

decrease by 50%

(b)

increase by 50%

(c)

decrease by 25%

(d)

increase by 300%

Opening a door is an example of _______

(a)

a non contact force

(b)

contact force

(c)

balanced

(d)

unbalanced

The resultant of action & reaction forces is ______

(a)

greater than zero

(b)

less than zero

(c)

zero

(d)

ore

A lift of mass 1000 kg which is moving with an acceleration of 1 ms^-2 in upward direction, then the tension developed in string which is connected to lift is

(a)

10,000 N

(b)

10,800 N

(c)

9800 N

(d)

11000 N

If the energy of the incident and scattered beam of light are same, then it is called ______ scattering

(a)

Ray light

(b)

Inelastic

(c)

Mie

(d)

Elastic

The phenomena of light responsible for the working of the human eye is

(a)

Reflection

(b)

Refraction

(c)

Power

(d)

Accommodation

Temperature is the average ______ of the molecules of a substance

(a)

difference in K.E and P.E

(b)

sum of P.E and K.E

(c)

difference in T.E and P.E

(d)

difference in K.E and T.E

Which of the following has the fastest process of heat transfer?

(a)

Conduction

(b)

convection

(c)

Radiation

(d)

all the above

Absolute scale is also called as ______

(a)

Kelvin scale

(b)

Celsius scale

(c)

Centigrade scale

(d)

Fahrenheit scale

The resistance of a conductor is inversely proportional to its _______.

(a)

Volt

(b)

Length

(c)

Area

(d)

None of the above

Which of the following produces large joule heating effect?

(a)

1A current through 2Ω resister for 3 seconds

(b)

1A current through 3Ω resistor for 2 seconds

(c)

2A current through 1Ω resistor for 2 seconds

(d)

3A current through 1Ω resistor for 1 second

Ultrasound waves compared to audible sound waves have.

(a)

Lower frequency and Shorter wavelength

(b)

Lower frequency and longer wavelength

(c)

higher frequency and longer wavelength

(d)

higher frequency and shorter wavelength

____________ isotope is used for the treatment of cancer.

(a)

Radio Iodine

(b)

Radio Cobalt

(c)

Radio Carbon

(d)

Radio Nickel

Positively charged radioactive rays are called _________ rays.

(a)

∝

(b)

β

(c)

૪

(d)

neutral

Atom bomb explosions produce ______ waves.

(a)

gravitational

(b)

sand

(c)

shock

(d)

electric

Mass of 1 mole of Nitrogen atom is

(a)

28 amu

(b)

14 amu

(c)

28 g

(d)

14 g

The relative atomic masses of many elements are not whole number because

(a)

they are not determined accurately

(b)

they exist as isotopes

(c)

due to impurities

(d)

atoms ionize

The vapour density of the Helium gas is

(a)

Equal to 1

(b)

Less than 1

(c)

Greater than 1

(d)

0

Neon shows zero electron affinity due to _____.

(a)

stable arrangement of neutrons

(b)

stable configuration of electrons

(c)

reduced size

(d)

increased density

The solubility of gases in liquid increases with ____________

(a)

increased volume

(b)

increased pressure

(c)

decreased pressure

(d)

none of these

The chemical equation Na₂SO_4(aq) + BaCl_2(aq) → BaSO_4(s)↓ + 2NaCl_(aq) represents which of the following types of reaction?

(a)

Neutralisation

(b)

Combustion

(c)

Precipitation

(d)

Single displacement

When Zinc metal is placed in hydrochloric acid, the gas evolved is _________________

(a)

CO

(b)

CO₂

(c)

H₂

(d)

H₂O

Ethanoic acid turns

(a)

red litmus blue

(b)

blue litmus red

(c)

red litmus green

(d)

blue litmus green

The xylem and phloem arranged side by side on same radius is called _________

(a)

radial

(b)

amphivasal

(c)

conjoint

(d)

None of these

A patient with blood group O was injured in an accident and has blood loss. Which group of blood should be used by doctor for transfusion?

(a)

O group

(b)

AB group

(c)

A and B group

(d)

All blood group

The number of______ increases during allergy.

(a)

Basophil

(b)

RBC

(c)

Eosinophil

(d)

Monocyte

The _____ is the second largest part of the brain.

(a)

cerebrum

(b)

medulla

(c)

cerebellum

(d)

pons

To increase the sugar production in sugarcanes they are sprayed with _______

(a)

Auxin

(b)

Cytokinin

(c)

Gibberellins

(d)

Ethylene

_____ is called Stress hormone.

(a)

Auxin

(b)

Gibberellin

(c)

Cytokinin

(d)

ABA

_______from anterior pituitary stimulates milk secretion

(a)

Oxytocin

(b)

Prolactin

(c)

Progestrone

(d)

Oestrogen

The number of chromosomes found in human beings are __________________.

(a)

22 pairs of autosomes and 1 pair of allosomes.

(b)

22 autosomes and 1 allosome

(c)

46 autosomes

(d)

46 pairs autosomes and 1 pair of allosomes.

________is a gene mutation

(a)

Deletion

(b)

Duplication

(c)

Translocation

(d)

Ploidy

Excessive consumption of alcohol leads to

(a)

Loss of memory

(b)

Cirrhosis of liver

(c)

State of hallucination

(d)

Supression of brain function

All files are stored in the _____________

(a)

Folder

(b)

box

(c)

Pai

(d)

scanner