Mixing sugar in a glass of milk using a spoon is ______

(a)

force

(b)

momentum

(c)

inertia of motion

(d)

inertia of direction

A body of mass 1 kg is attracted by the earth with a force which is equal to

(a)

9.8 N

(b)

6.67 x 10¹¹

(c)

1 N

(d)

9.8 ms^-1

We can see objects because of

(a)

reflection

(b)

refraction

(c)

transmission

(d)

diffraction

According to snell's law

(a)

\(\mu=\frac{\sin i}{\sin r}\)

(b)

μ =\(\frac { { c }_{ a } }{ { c }_{ m } } \)

(c)

\(\mu=\frac{\sin r}{\sin i}\)

(d)

μ=\(\frac { { c }_{ m } }{ { c }_{ a } } \)

The change in the focal length of human eye is caused by

(a)

Pupil

(b)

Ciliary muscles

(c)

Cornea

(d)

Iris

The resolving power depends on

(a)

Dimetal of the lens

(b)

Wavelength

(c)

Refractive index

(d)

a & b

Increase in area due to heating is called

(a)

Linear expansion

(b)

Superficial expansion

(c)

Cubical expansion

(d)

real expansion

The resistance of material depends on.

(a)

Temperature

(b)

Length of conductor

(c)

Area of cross-section

(d)

All the above

If the resistance in a series circuit doubles, total current will be

(a)

doubles

(b)

halved

(c)

same

(d)

Increases

Sound can travel in

(a)

air

(b)

any material medium

(c)

vacuum

(d)

none

Henry Becquerel discovered ________ in 1896

(a)

nucleus

(b)

atom

(c)

isotopes

(d)

radioactivity

The first nuclear reactor was built at  _________.

(a)

New York

(b)

San Francisco

(c)

New Jersey

(d)

Chicago

An atom of an element has 13 electrons and mass number 27. The nucleus of this atom contains ____________ neutrons.

(a)

26

(b)

13

(c)

14

(d)

27

Pick the correct order on decreasing trend of atomic size

(a)

Mg, Mg⁺, Mg²⁺

(b)

Mg⁺, Mg²⁺, Mg

(c)

Mg²⁺, Mg⁺, Mg

(d)

Mg²⁺, Mg, Mg⁺

White vitriol is ________

(a)

CaSO₄·7H₂O

(b)

MgSO₄.7H₂O

(c)

K₂SO₄.7H₂O

(d)

ZnSO₄.7H₂O

Pick out the metal that displaces hydrogen from hydrochloric acid.

(a)

Zinc

(b)

Silver

(c)

Copper

(d)

Gold

Alcohols + Acids  Esters. This reaction is ___________

(a)

Ester hydrolysis

(b)

Esterification

(c)

Dehydrogenation

(d)

Oxidation

Name the tissue present between the upper and lower epidermis.

(a)

Lower epidermis tissue

(b)

Pith

(c)

Upper epidermis tissue

(d)

Mesophyll

___________is the main circulatory medium in the human body.

(a)

Blood

(b)

Water

(c)

Lymph

(d)

Plasma

_________is a basal part of the Ovule.

(a)

Chalaza

(b)

Micropyle

(c)

Nucellus

(d)

Funiculus