10th Class Science Part 1 Test 2
Science and technology Class 10th Part 1 Test 2
Chapter 5th to 10th
When a Ray of light travel from rarer medium to denser medium it.?
Goes away from normal
Bends towards normal
Goes straight
Reflected back
The optical instruments like camera , microscopes telescopes work on which principle?
Scattering of light
Dispersion of light
Refraction of light
Reflection of light
An object placed under water appears to be raised because of ?
Scattering
Reflection
Refraction
Absorption
Which of the following best describes snell’s law?
Sin i – sin r = C
Sin i / sin r = C
Sin i + sin r = C
Sin r / sin c = C
Which of the substances / medium have highest refractive index?
Diamond
Kerosene
Air
Water
A lens which is thick at the centre but spinner at the edge are called?
Concave lens
Convex lens
Bifocal lens
None of these
When object is placed between focus and optical centre of a convex lens then image formed is ?
Real and inverted
Real and Erect
Virtual and inverted
Virtual & Erect
What is the speed of light in glass medium ?
3 × 10^8 m/s
2 × 10^8 m/s
4 × 10^8 m/s
1 × 10^8 m/s
What is the lens formula?
v + u = t
1/v + 1/u = 1 /t
v – u = t
1/v – 1/u = 1 /t
The order of seven colours of light is called?
VIBROYG
VIBGYOR
ROGYBIV
ROYVIBG
Untitled Title
The image formed by a concave lens is always ……..
Virtual & Inverted
Virtual & Erect
Real & Erect
Real & Inverted
The minimum distance of distinct vision for a normal human eye is ….
infinite
25 cm
0 cm
20 cm
A …… lens is used in simple microscope.
Convex
Both a & b
None of these
Concave
Inside water an air bubble behaves like a ………..
Convex mirror
Flat plate
Convex lens
Concave lens
The power of convex lens is ………..
None of these
Positive
Both a & b
Negative
Find odd one
Planet
Stars
Satellites
Rainbow
Find odd one
Spectrometer
Hypermetropia
Presbyopia
Myopia
The power of lens with focal length 20 cm is ….
0.5D
5D
10D
0.5cm
The focal length of concave lens is…………
Positive
Both a & b
Negative
None of these
When image is formed at 2F2 then object is placed at …… of a convex lens.
at 2F2
at F2
at F1
at 2F1
Annealing improves ————-
Grain size
Mechanical properties
Electrical properties
All of above
The product from blast Furnace is called—————-
Steel
Cast iron
Pig iron
Wrought iron
Which is closest to the purest form of iron?
Steel
Cast iron
Wrought iron
Pig iron
Eutectic reaction for iron-carbon system occurs at —-
723° C
1490° C
600° C
1147° C
The crystal structure of of iron is —————
Face centred cubic
Simple cubic
Body centred cubic
Close packed hexagonal
Steel can be harded quickly by the process of —-
Nitriding
Induction hardening
Cyaniding
Carburizing
Materials are softened by —-
Carburizing
Tempering
Normalizing
Annealing
Peritectic reaction is defined as —–
Two solids reacting not to form a liquid
Two solids reacting to form a liquid
Two solids reacting to form a third solid
A liquid and solid reacting to form another solid
The structure which have the highest packing of atoms are —
Hexagonal close packed lattice
Body centred cubic lattice
Simple cubic lattice
None of these
Which of the following metal has lowest melting point?
Tin
Zinc
Silver
Antimony
Chroline forms a _ molecule. diatomic monoatomic hexatomic triatomic In oxygen, we see the formation of a bond between two oxygen atoms.
double
single
quadruple
triple
Atom of oxygen has electrons in its 2nd shell and it requires two more electrons to complet octet. 4 3 5 6 The heteroatoms present in CH3 – CH2 – O – CH2 – CH2 Cl are a)oxygen b)carbon c)hydrogen d)chlorine a & b c & d b & c a & d Mineral acids are stronger acids than carboxylic acids because a) mineral acids are completely ionised, b) carboxylic acids are completely ionsied, c) mineral acids are partially ionsied, d) carboxylic acids are partially ionsied. b & c c & d a & d a & b The first member od alkyne homologous series is ….. * 2 points methane ethene propyne ethyne Carbon forms four covalant bonds by sharing its four valence electrons with four univalent atoms e.g. hydrogen. After the formation of four bonds, carbon attains the electronic configration of ….. * 2 points helium argon neon krypton The two electrons contributed by each oxygen atom give rise to shared pairs of electrons.
*
2 points
5
4
2
3
Nitrogen has the atomic number _ * 2 points 5 6 7 8 Pentane has the molecular formula C5H12 it has
*
2 points
17 convalent bonds
5 convalent bonds
12 convalent bonds
16 convalent bonds
If the height of the orbit of a satellite from the earth surface is increased, the tangential velocity of the satellite will * 2 points Increase Decrease remains same not change Hubble telescope is a _ satellite.
*
2 points
LEO
MEO
HEO
Natural
executed the first ever mission to moon in the world.
*
2 points
USA
India
Russia
Asia
All satellite work on “” energy. * 2 points solar Magnetic Muscular None of these Chandrayaan 1 discovered the presence of on the moon.
*
2 points
Iron
Soil
water
air
Which of the following satellite launchers is developed by India?
IRNSS
PSLV
JNSAT
EDUSAT
Satellite orbiting at a height equal to or greater than 35780km above the earth’s sarface is called as
2 points
HEO
LEO
MEO
VHEO
satellites collect the information regarding weather conditions. Navigational Weather Air Cloud is the natural satellite of the earth.
Man
Chandrayaan 1
Moon
Sputnik
The first artificial satellite __ was sent to space by the Soviet union.
Sputnik 1
Chandrayaan 1
Moon
Luna 2
