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TALLENTEX Papers 2021 - Class 8th

Section - A : Physics
Obejctive

1.    Different types of thermometers are used for different purposes. The thermometer used for giving tempratures in weather reports is known as

(1) Maximum -minimum Thermometer          

(2) Clinical Thermometer

(3) Laboratory Thermometer                        

(4) All of the above

2.    An aircraft is moving horizontally with a velocity of 600 m s-1. If all the forces acting on it are balanced, then how many of the following statement are true?

(1) It will fall down instantaneously                  

(2) It will lose its velocity gradually

(3) It still moves with the same velocity          

(4) It will float at same point in space.

3.    A vibrating object produces sound, in some cases vibrations have such an amplitude that we cannot see them. However, we can feel them. Find the correct match of musical instruments with vibrating part producing sound.
 

	Musical Instrument	Vibrating part producing sound
(1)	Tabla	Stretched string
(2)	Veena	Stretched membrane
(3)	Flute	Air-Column
(4)	Sitar	Air-Column

4.    Students in a science class conducted an investigation using a prism. The students reported the following observation.
White light goes into the prism on the left side and comes out on the right side of the prism as seven different colors.
The drawing shows their observations and the wavelength of each color of light.

Which statement best describes the behavior of the different colors of light exiting the prism after the white light shines on it?

(1) The different colors of light emerge at the same angles.

(2) The different colors of light reflect at different angles.

(3) The different colors of light refract at the same angle.

(4) The different colors of light refract at different angles.

5.    If a particle is moving with an acceleration having constant magnitude, then which of the fol- lowing can remain constant?

(1) Both speed and velocity                          

(2) Neither speed nor velocity

(3) Only the velocity                                      

(4) Only the speed

6.    600 PC charge passes through a point in 1 min. Find magnitude of current -

(1) 600 PA                

(2) 1 PA                    

(3) 10 PA                  

(4) 60 PA

7.    How many mirrors we require to make kaleidoscope ?

(1) One plane mirror

(2) Three plane mirrors

(3)  Two plane mirrors and one spherical mirror

(4) Three spherical mirrors

8.    When you touch an object it feels hot, which is true:

(1) object is at higher temperature then you

(2) object is at lower temperature then you

(3) Heat flow from your hand to object

(4) none of above

9.     Find acceleration of object due to forces acting on the object according to diagram shown-

(1) 2 m/s²                          

(2) 1 m/s²                          

(3) 1.25 m/s²                    

(4) 1.5 m/s²

10.   The intensity of sound wave gets reduced by 10% of initial level on passing through a slab.
The total reduction in intensity on passing through three consecutive slabs is

(1)  30%                    

(2) 70%                      

(3) 27.1%                  

(4) 72.9%

INTEGER TYPE

11.   An athlete completes half round of a circular track of radius R, then the displacement covered by the athlete is n R. What is the value of n ?

12.    There are 8 bulbs arrange as shown in figure. When switch S, is closed how many bulbs will glow.

13.   Teacher asked four students A,B,C,D and E to perform an activity to prove the law of reflection through plane mirror. They performed the experiment and recorded following observations.

How many student (s) obtained the correct result?

14.   Four identical light bulbs are shown in figure. How many bulb(s) glow, if the bulb A fails, so that it cannot conduct?

15.   In a cricket match, a cricketer tries to play hook shot but the ball takes the edge of his bat and rises vertically upwards with an initial velocity of 30 m/s. The fielder settles himself under the ball and takes the catch comfortably after n seconds since the batsman had edged the ball. What would be the value of n ?
(Take g = 10 m/s2 and neglect any air resistance)

16.   The range between lower fixed point and upper fixed point is divided into                    parts on Fahrenheit scale.

17.   In diagram shown find pressure exerted on the surface of cuboid in pascal.

18.   Displacement-distance graph of any wave is shown in the figure. Its wavelength will be

19.   A ray strikes mirror M at an angle of incidence 40° and is reflects away. It will hit the mirror N at an angle of incidence             °.

20.   A force of 225 dynes is acting on rectangular area of side 6 cm & 5 cm, the pressure exerted by force in pascal is :

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Section - B : Chemistry
Objective

21.   What happens when an acid is slowly added to water?

(1) It releases heat                                    

(2) It absorbs heat

(3) There is no heat change                      

(4) It undergoes neutralization.

22.   People obtain ground water through                    and                 _.

(1) Rain, well              

(2) handpump, Lake  

(3) River, Lake          

(4) Well, Tube well

23.   How does colourless phenolphthalein change in the presence of bases?

(1) Remains colourless

(2) Becomes pink

(3) Becomes red

(4) Becomes green

24.   X is the base which is soluble in water. Then the metal present in the base is

(1) aluminium    

(2) sodium    

(3) copper    

(4) iron

25. PET is a/an

(1) Amine    

(2) Ester    

(3) Amide    

(4) Carbide

26.   The ash obtained on burning magnesium ribbon is dissolved in water. What is the nature of the prepared solution?

(1) Acidic                  

(2) Alkaline                

(3) Amphoteric          

(4) Neutral

27.   Which of the following metals do not react even with steam?

(1) Silver                  

(2) Iron                      

(3) Calcium              

(4) Sodium

28.   Which of the following is a physical but irreversible change?

(1) Lighting of an electric bulb                      

(2) Switching on a fan

(3) Crushing of a glass                                

(4) melting of an ice cream

29.   Water is colourless, odourless, tasteless liquid. It’s boiling and freezing points are respec- tively :

(1) 0°C and 100°C    

(2) 373 K and 273 K  

(3) 37°F and 98.4° F  

(4) 273 K and 373 K

30.    A chemical change may not involve :–    

(1) Change in colour    

(2) Change in temperature

(3) Evolution of gas    

(4) Change in mass of substance

INTEGER TYPE

31.   Methyl orange will show yellow colour in which of the following substance?
Milk of magnesia, Curd, Lime water, Lemonade, Orange juice

32.   How many compounds will give hydroxide ion(OH–) in aqueous solution.
NaOH, HCl, MgCl2, H3PO4, CH3COOH, Ca(OH)2, KOH

33.   According to the recommendation of United Nations, minimum 50 litres or three buckets of water per person should be provided. According to this How many of the following activities shows water shortage?
(i)   Taps running dry.
(ii)  Long queues for getting water.
(iii) Marches and poster for demand of water.
(iv)  A family gets three buckets of water per day for each.
(v)  Millions of refugees seeking homes in a location accessible to water.
(vi)  Hard manual labour takes time that they might otherwise spend pursuing education or earning additional income.

34.   Find out the total no. of the natural fabric from the following fabrics-

(i) Polythene    

(ii) PVC    

(iii) Nylon

(iv) Cotton    

(v) Rayon    

(vi) Jute

(vii) Polyester    

(viii) Acrylic    

35.   A man painted his main gate made up of Iron, to

(i) prevent it from rusting                            

(ii) Protect it from the sun

(iii) make it look beautiful                          

(iv) make it dust–free. How many statement(s) are correct.

36.   Find how many of the following materials are made of thermosetting plastics.
Cooker handles, Switchboards, Bucket, Mugs, Table, Chair, Polythene bag, Floor tiles, Vulcanized rubber, Plastic bottle, Medical equipment, Control knobs, Laminates for surfaces.

37.   How many bases are strong in nature?

(i) NaOH    

(ii) Ca(OH)₂    

(iii) Mg(OH)₂

(iv) KOH    

(v) NH₄OH    

38.   Read the following properties of Rayon carefully-

(i) It is a semisynthetic fibre.

(ii) It is prepared by chemical treatment of wood pulp(cellulose).

(iii) It resembles to wool so known as artificial wool.

(iv) It can absorb moisture.

(v) It is shiny and lustrous.

How many of these properties are correctly represent Rayon.

39.   How many of the following is/are solid form of water?
Rain, Dew, Snow, Hail, Frost

40.   Metals react with acid and produce hydrogen gas which burns with 'POP' sound.
Na, Mg, Cu, K, Al, Pt, Au, Zn, Fe
How many metals, given in above box release hydrogen gas with reaction of sodium hydroxide which burns with 'POP' sound?

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Courtesy : CBSE