Stars and the solar system

   Stars and the solar system

         CLASS - 8 

(Q.1)  On full moon day

(a) Moon lies in between the Earth and the Sun
(b) Earth lies in between the moon and the Sun
(c) Sun lies in between the Earth and the moon
(d) Sun lies at the top of moon and earth
 

(Q.2)  Which planet has 30 satellites

(a) Saturn
(b) Pluto
(c) Uranus
(d) Jupiter
 

(Q.3)  Time taken by the Earth to go once around the Sun is:

(a) 365 days.
(b) 365.45 days.
(c) 365.75 days.
(d) 365.25 days.
 

(Q.4)  Halley’s comet appears after every

(a) 75 years.
(b) 73 years.
(c) 76 years.
(d) 72 years.
 

(Q.5)  Moon’s surface is

(a) Smooth
(b) Fertile
(c) Dusty and barren
(d) Plane
 

(Q.6)  Pole star changes its position in the sky because:

(a) It is an imagination.
(b) It lies on the axis of rotation of earth.
(c) It lies on 30° to the axis of rotation of earth.
(d) Moon kept it stationary in sky.
 

(Q.7)  Write the name of first satellite of India.

(Q.8)  What is a natural satellite?

(Q.9)  Why do we classify the sun as a star?

(Q.10)  Which comet appears after every 76 years?

(Q.11)  Name a star that always appear stationary from earth’s surface?

(Q.12)  What do you mean by the term phases of moon?

(Q.13)  What are celestial bodies?

(Q.14)  Why the village sky is so different from the night sky in big cities?

(Q.15)  The star nearest to the Earth after the Sun is:

(a) Alpha Centuari.
(b) Pole star.
(c) Shooting star.
(d) Moon.
 

(Q.16)  Light year is equal to

(a) 9.46 x 10¹² km.
(b) 3.46 x 10¹² km.
(c) 3 x 10¹² km.
(d) 2 x 10¹² km.
 

(Q.17)  Polaris is the name given to a star situated in the north direction. The other name of the star is

(a) Great bear
(b) Orion
(c) Pole star
(d) Ursa minor
 

(Q.18)  Distance between the stars is measured in:

(a) Kilometers.
(b) Meters.
(c) Light years.
(d) Chandra Shekhar Limit.
 

(Q.19)  Which of the following planet is called morning star:

(a) Venus.
(b) Mercury.
(c) Pluto.
(d) Neptune.
 

(Q.20)  Venus is brightest planet because of:

(a) Ozone layer around it.
(b) Cloudy atmosphere of nitrogen.
(c) Cloudy atmosphere of carbon dioxide.
(d) Layer of jugnus around it.
 

(Q.21)  Which of the following statements is false about Venus?

(a) Venus keeps its same face towards the sun.
(b) Its day side temperature is too high and night side temperature is too low.
(c) It has a thick atmosphere of carbon dioxide, which contributes to its excessive dayside temperature.
(d) It rotates from west to east about its axis.
 

(Q.22)  Change of seasons on the earth takes place due to the reason that

(a) The axis of rotation of the earth is tilted at an angle of 60° with the vertical.
(b) The earth is not always at the same distance from the sun, on account of its slightly elliptical orbit around the sun.
(c) The temperature of earth keeps on changing.
(d) The sun sends unequal amount of light andis responsible for the change in season.
 

(Q.23)  Match the following: Column I Column II I. Coldest planet A.Mars II. Bluish planet B.Saturn III. Plant with rings around C. Uranus IV. Red planetD. Pluto

(a) I-B, II-A, III-D, IV-C
(b) I-C, II-B, III-A, IV-D
(c) I-D, II-C, III-B, IV-A
(d) I-A, II-D, III-C, IV-B
 

(Q.24)  Match the following: Column I Column II IDon't twinkle A.Meteors II.Group of stars B.Planets III.Burning pieces of rocksC.Asteroids IV.A belt of debris between D.Constellation Mars and Jupiter

(a) I-B, II-D, III-A, IV-C
(b) I-C, II-A, III-B, IV-D
(c) I-D, II-B, III-C, IV-A
(d) I-A, II-C, III-D, IV-B
 

(Q.25)  Which of the following can reach on the surface of earth:

(a) Meteors.
(b) Meteorite.
(c) Comets.
(d) Asteroids.
 

(Q.26)  What reason you assign for the formation of day and night on the earth?

(a) Revolution of sun around the earth
(b) Revolution of earth around the sun
(c) Revolution of earth on its own axis
(d) Revolution of moon around earth
 

(Q.27)  On new moon day

(a) The moon is between the sun and earth
(b) The sun is between the moon and earth
(c) The earth is between the sun and moon
(d) Sun lies at the top of moon and earth
 

(Q.28)  Jupiter's red spot is really a:

(a) A big storm.
(b) A layer of red clouds.
(c) An active volcano.
(d) A river of blood.
 

(Q.29)  A group of stars forming some recognizable shape are known as

(a) Galaxy.
(b) Constellation.
(c) Comets.
(d) Asteroids.
 

(Q.30)  Which of the following is natural satellite of a planet?

(a) Phorbes
(b) Vagus
(c) Deimos
(d) Ceimos
 

(Q.31)  Halley comet was last seen in:

(a) 1910.
(b) 1986.
(c) 1923.
(d) 1999.
 

(Q.32)  Which of the following is false about Neptune?

(a) It was discovered by an English astronomer, William Herschel in 1781.
(b) It has 8 satellites revolving around it.
(c) No life is possible on this planet on account of very low temperature.
(d) Neptune is at a distance of 4495.1 × 109 km from the sun.
 

(Q.33)  Which of the following planet has largest numbers of moons ?

(a) Saturn
(b) Uranus
(c) Earth
(d) Jupiter
 

(Q.34)  In how much time moon completes one revolution around the earth?

(a) 27(1/3) days.
(b) 29(1/2)days.
(c) 15 days.
(d) 30 days.
 

(Q.35)  Moon always presents same face towards the earth because:

(a) Moon completes one revolution between one new moon to next new moon in 29(1/2) days.
(b) It takes exactly the same time to spin once about its axis.
(c) The moon completes one revolution around the earth in29(1/2) days.
(d) The moon absorbs the light from sun.
 

(Q.36)  Shooting star is a:

(a) Meteor.
(b) Meteorite.
(c) Asteroid.
(d) Comet.
 

(Q.37)  Large number of small bodies between the orbits of Mars and Jupiter that revolve around the sun are called:

(a) Comets.
(b) Meteors.
(c) Meteorites.
(d) Asteroids.
 

(Q.38)  Which of the following does not operates through satellites?

(a) Transport system.
(b) Mobile phones.
(c) Internet.
(d) Television programme.
 

(Q.39)  Remote sensing means

(a) Collecting information from a distance
(b) Breaking a remote
(c) Marketing of remote
(d) Making a remote
 

(Q.40)  Which of the following is false about satellites

(a) Long distance transmission of television programme becomes possible with the help of artificial satellites.
(b) Artificial satellites are also used to gather information about movements of materials concerning defence activities.
(c) Artificial satellites are also used for research.
(d) Moon is much closer to earth than the artificial satellites.
 

(Q.41)  Which planet takes minimum time in one revolution around sun:

(a) Earth.
(b) Jupiter.
(c) Mercury.
(d) Saturn.
 

(Q.42)  Which out of the following has density less than water:

(a) Earth.
(b) Jupiter.
(c) Mercury.
(d) Saturn.
 

(Q.43)  The Milky Way Galaxy is …………….. in shape

(a) Spherical.
(b) Elliptical.
(c) Spiral.
(d) Circular.
 

(Q.44)  Venus is ………… than Mercury

(a) Hotter.
(b) Colder.
(c) Smaller.
(d) At same temperature.
 

(Q.45)  Which one out of following is not called terrestrial planet:

(a) Jupiter.
(b) Earth.
(c) Mercury.
(d) Venus.
 

(Q.46)  Which of the following is not a member of the solar system?

(a) A black hole
(b) A satellite
(c) A comet
(d) An asteroid
 

(Q.47)  Which of the following is not a planet of the sun?

(a) Mercury.
(b) Saturn.
(c) Sirius.
(d) Earth.
 

(Q.48)  The study of universe is known as

(a) Astronomy.
(b) Aeronautics.
(c) Genomic.
(d) Geology.
 

Maths class 8th algebric expressions and quadratic equations

Maths                                                 Class - 8th   (Q.1)  In complete factorised form, the expression 4a2 – 4a + 1 is equivalent to

( 1 mark )

(a) (2a - 1)².
(b) (2a - 1).
(c) 2(a – 1).
(d) 2(2a -1).

(Q.2)  In complete factorised form, the expression a2 + 5a + 6 is equivalent to

( 1 mark )

(a) a² + 3.
(b) (a + 2)(a + 3).
(c) (a + 6)(a - 1).
(d) (a + 3)(a – 2).

(Q.3)  The factors of x2 – 7x + 12 are

( 1 mark )

(a) (x - 4).
(b) (x - 3).
(c) (x + 4) and (x + 3).
(d) (x - 3) and (x - 4).

(Q.4)  Dividing 64a2b4c3 by 8a2b2c3 gives

( 1 mark )

(a) 8a².
(b) 8b².
(c) 8.
(d) 8abc.

(Q.5)  The product of (a -4)(a +4) is

( 1 mark )

(a) (a² + 16).
(b) (a - 4)².
(c) (a + 4)².
(d) (a² – 16).

(Q.6)  Subtract 7x -3x² from 4x + 8x²

(Q.7)  Sum of 4xy and -3xy is

( 1 mark )

(a) 7xy
(b) 4xy
(c) 3xy
(d) xy

(Q.8)  Expressions that contains only one term is called:

( 1 mark )

(a) Identity
(b) Monomial
(c) Like Term
(d) UnlikeTerm

(Q.9)  Unlike term of the expressions 7x, 7xy, x, -4x is

( 1 mark )

(a) 7xy
(b) 7x
(c) x
(d) -4x

(Q.10)  Find the co-efficient of x2, xy and y in the expression – 4x2 + xy – y are

( 1 mark )

(a) 4, 1, 1
(b) -4, 1, -1
(c) 1, -4, -2
(d) 2, 1, -1

chemisty matter in our surrounding

       Chemisty - class 9th

 Matter and its compositions, Mixtures

(Q.1)  On heating, kinetic energy of the molecules:

( 1 mark )

(a) Decreases
(b) Increases
(c) Either decreases or increases
(d) Remains same

(Q.2)  Which of the following does not affect evaporation?

( 1 mark )

(a) Surface area
(b) Humidity
(c) Pressure
(d) Temperature

(Q.3)  The standard room temperature is taken as

( 1 mark )

(a) 0 K.
(b) 273K.
(c) 298K.
(d) 373K.

(Q.4)  Solid carbon dioxide (dry ice) when kept in air, forms carbon dioxide gas by the process of

( 1 mark )

(a) sublimation.
(b) diffusion.
(c) fusion.
(d) condensation.

(Q.5)  In the mixture of sand, common salt, ammonium chloride and iron powder, the substance that sublimes is

( 1 mark )

(a) sand.
(b) common salt .
(c) ammonium chloride .
(d) iron powder

(Q.6)  When a bottle of perfume is opened in a room, we can smell it even from a considerable distance due to

( 1 mark )

(a) osmosis.
(b) diffusion.
(c) fusion.
(d) condensation.

(Q.7)  If ice and water both have the same temperature of 00C, the kinetic energy of water molecules is

( 1 mark )

(a) high in both water and ice.
(b) low in both waterand ice.
(c) lower in waterthanice.
(d) higher in waterthan ice

(Q.8)  The right procedure to separate sand, common salt and ammonium chloride from a mixture is

( 1 mark )

(a) dissolving in water, evaporating and sublimation .
(b) evaporation, dissolving in water and then, sublimation.
(c) sublimation, dissolving in water, filtration and evaporation.
(d) dissolving in water, filtration, evaporation and sublimation

(Q.9)  Iodine, ammonium chloride and dry CO2 are good examples to show the phenomenon of

( 1 mark )

(a) diffusion.
(b) sublimation.
(c) condensation.
(d) evaporation.

(Q.10)  On increasing the temperature, the rate of diffusion of gases

( 1 mark )

(a) increases.
(b) decreases.
(c) remains the same.
(d) first decreases then increases.

(Q.11)  What are the factors, that determine the state of a substance? 

(Q.12)  Liquids generally have lower density as compared to solids. But ice floats on water. Why?

(Q.13)  Why do solids generally lack the property of diffusion?

(Q.14)  How will you demonstrate that air contains water vapours?

(Q.15)  Convert the following temperatures into the Kelvin scale.
(a) 25⁰c
(b) 373⁰c

Q.16)  Why are we able to sip hot tea or milk faster from a saucer rather than a cup?

Q.17)  Convert the following temperature to Celsius scale:
(a) 300 k
(b) 573 k.

(Q.18)  Differentiate between evaporation & boiling

Q.19)  Give two reasons to justify.

a) Water at room temperature is a liquid.
b) An iron almirah is a solid at room temperature.

(Q.20)  What are the characteristics of the particles of matter?

(Q.21)  Define the following terms.
Fusion, latent heat of fusion, boiling point, latent heat of vaporization, sublimation.