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WorksheetsCLASS 8 (CBSE) MIXED BAG QUESTIONS QUIZ
Total questions: 60
Worksheet time: 20mins
The disease caused by fungi is
Measles
Cholera
Ringworm
Tuberculosis
Animals exhibiting external fertilisation produce a large number of gametes. Pick the appropriate reason from the following
The animals are small in size and want to produce more offsprings.
Food is available in plenty in water.
To ensure better chance of fertilisation.
Water promotes production of large number of gametes.
Pure or distilled water is a _____________ of electricity.
good conductor
poor conductor
Both 1st and 2nd option
None of these
Internal fertilisation takes place
inside male body
outside female body
outside male body
inside female body
What helps in the rise of bread or dosa dough?
Heat
Production of alcohol
Growth of yeast cells
Low pressure
A student did a set of experiment using a balloon and a glass rod. In which of the following experiments will the balloon will be repelled from the glass rod?
Positively charged balloon and negatively charged glass rod
Negatively charged balloon and positively charged glass rod
Neutral balloon and neutral glass rod
Positively charged balloon and Positively charged glass rod
Which is not a non-electrolyte?
Ethyl chloride
Urea
Potassium solution
Sodium Chloride
___________ like silicon and germanium share characteristics of both metals and non metals.
Metals
Metalloids
Non metals
None of these
Which of the following options is/are true about the disease, microorganism which cause them and the symptoms of the diseases?
Malaria, Protozoan, Low bone density and Chills
Hepatitis B, Virus, Swollen liver
Both 1st and 2nd options
TB, Protozoan, Coughing up blood and Consistent Chest pain
When electricity is passed through calcium nitrate solution in water, what is likely to be formed at the cathode and why?
Hydrogen because it is more reactive than calcium
Calcium because it is more reactive than hydrogen
Hydrogen because it is less reactive than calcium
Calcium because it is less reactive than hydrogen.
What is the role of sperms in reproduction?
To stimulate ovum
To form foetus
To initiate changes in male during puberty
To fertilize the egg
Match the column
p -> ii , q-> iii, r -> i
p -> ii , q-> i, r -> iii
p -> iii , q-> ii, r -> i
p -> iii , q-> ii, r -> i
Which bacteria helps in settling of curd?
Rhizopus
Vibrio cholerae
Lactobacillus
Spirulina
Which of the following is/are true in regard of secondary sexual characteristics of boys?
Growth of facial hair
Development of bones and muscles
Production of sperms
All of these
When a neutral ebonite rod and neutral fur are rubbed against each other.
Then
(i) Fur will be positively charged and ebonite will be negatively charged.
(ii) The magnitude/strength of charge will be equal on both but the nature will be unequal.
(iii) Fur will be negatively charged and ebonite will be positively charged.
(iv) The magnitude/strength of charge will be unequal on both but the nature will be equal.
Which of the following is correct ?
(ii) and (iii)
(i) and (ii)
(ii) , (iii) and (iv)
(i) , (ii) and (iv)
In the given figure, Electrolyte, Anode and Cathode respectively are labelled as
A, B and C
B, A and C
B, C and A
A, C and B
Which of the following does not take place during the final stage of the menstrual cycle?
Growth and thickening of the uterine lining.
Shedding of the uterine lining.
Menstrual blood and tissue flow out of the body from the uterus
None of these
The diagram shows a beaker containing a solution of Zinc sulphate and two Carbon electrodes.
A battery is placed next to it.
In order that the electrode P is electroplated plated with Zinc, what connections should be made ? (Refer the diagram)
P must be connected to S and Q to R
P must be connected to Q and S to R
P must be connected to R and Q to S
P and Q must be connected to R.
Which of following statement is false :
Charging by friction occurs when two neutral bodies are rubbed again each other
Charging by induction occurs when a charged body comes near a neutral body
Charging by conduction occurs when two neutral bodies are touched
Electroscope is used to find if a particular object carries charge.
Identify W, X and Y?
W- Virus ; Y- Yeast ; Z- Protozoan
W- Virus ; Y- Bacteria ; Z- Algae
W-Yeast ; Y- Virus ; Z- Protozoan
W-Protozoan ; Y- Virus ; Z- bacteria
The cell formed after fertilisation is called
embryo
foetus
zygote
ovum
How is lightning useful to us?
It helps in nitrogen fixation an promotes plant growth.
It helps in the evolution of a new species
Formation of ozone layer
All of the above
Which of the following statements is incorrect ?
Anode is an electrode connected to the positive terminal of the battery.
Distilled water is poor conductor of electricity.
Electrolysis is used in the refining of impure metals.
Ions are carriers of only positive charges.
In the list of animals given below, hen is the odd one out.‘human being, cow, dog, hen’The reason for this is
it undergoes internal fertilisation
it is oviparous
it is viviparous
it undergoes external fertilisation
Which of the following allow the transfer of electric charges from one object to another ?
Insulator
Electroscope
Vacuum
Conductor
Which of the following can affectively prevent the ringworm disease?
Antibiotics
Improving personal hygiene
Improving oral hygiene
Vaccination
ASSERTION: Carbon and Nitrogen react with dilute HCl and dilute H2SO4.
REASON: Generally metals do not react with dilute HCl and dilute H2SO4.
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
Assertion (A) is true but reason (R) is false.
Assertion (A) is false but reason (R) is true.
Suppose you are in a thunderstorm.
Which of the following is the best way to protect yourself from the possible harm?
Staying back in the car
Getting out of the car and taking cover under the car.
Running to a short tree 200m away from the car.
Getting out and taking shelter under an electric pole.
Which of the following is the characteristic feature that distinguishes an Fungi from Algae ?
Being Autotrophic
Being Heterotrophic
Being Saprophytic
Being Parasitic
Which of these hormones is secreted by endocrine gland located on the top of kidneys?
Adrenaline
Insulin
Glucagon
Progesterone
Interaction between charges at huge scale is called
Electric discharge
Lightning
Earthing
Grounding
ASSERTION: When 2 balloons were rubbed with woollen cloth, they repelled each other.
REASON: Both the balloons acquired a positive charge.
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
Assertion (A) is true but reason (R) is false.
Assertion (A) is false but reason (R) is true..
Incomplete development of female secondary sexual characteristics is caused due to deficiency in?
Testosterone
Cortisol
Estrogen
Progesterone
Which of the following is represented by 'X' in the figure given below?
Algae
Protozoa
Mold
Virus
The bumpers and door handles of motor cars, taps etc. are coated with silvery layer of chromium because
(i) It does not easily get corroded.
(ii) It forms a hard layer which does not easily get scratched.
(iii) It tarnishes quickly.
(iv) It is cheap.
Which of the following options is/are correct?
(iii), (ii) & (iv)
(i), (ii) & (iv)
(iii) & (iv)
(i), (ii) & (iii)
A common preservative used in jam and pickles is
Sodium benzoate
Nitric acid
Sodium tribenzoate
Sodium Chloride
ASSERTION : The sound of the human voice is produced due to vibrations in the vocal cords.
REASON : Vibration means a kind of rapid to and fro motion of an object.
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
Assertion (A) is true but reason (R) is false.
Assertion (A) is false but reason (R) is true.
Which of these is a fungal disease commonly seen in plants?
Citrus Canker
Rust of wheat
Tomato Mosaic Virus Disease
Anthrax
Which of the following transports hormones from the place of origin to the place of target?
Ducts
Blood
Nerves
Lymph
Lightning strikes on the ground when
air between the two charges is unable to resist the flow.
air between the two charges is sufficient to resist the flow
there is absence of air in between the two charges
moisture between the two charges is insufficient to resist the flow.
Assertion (A): Zinc can easily displace copper on reacting with a solution of copper sulphate.
Reason (R) : Copper is more reactive metal as compared to Zinc.
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
Assertion (A) is true but reason (R) is false.
Assertion (A) is false but reason (R) is true.
Identify the correct sequence that is followed during the growth of human being?
1. Foetus 2. Zygote 3. Embryo
4. Baby 5. Adult 6. Adolescent 7. Child
1, 3, 2, 4, 7, 6, 5.
2, 1, 3, 4, 7, 5, 6.
2, 3, 1, 4, 7, 6, 5.
3, 2, 1, 4, 6, 7, 5.
When electrodes are immersed in water and electricity is allowed to pass, the bubbles formed on the positive terminal is actually _______ gas.
Hydrogen
Oxygen
Hydroxyl ions
Oxide ions
Which glands are dual in their functioning in the human body?
Pancreas and Pituitary Gland
Thyroid glands and Ovaries
Testes and Adrenal glands
Pancreas and Testes
Name the chemist who showed bubbles of Oxygen and hydrogen are produced when electric current passes through water.
William Nicholson
Alessandro Volta
William Harvey
Luigi Galvani
It is a convention to call the charge acquired by a glass rod when it is rubbed with silk as __________
Positive
Negative
Neutral
Electronegative
Which of the following represents the composition of female destined zygote in human beings?
22 + XX.
44 + XY.
46 + XY.
44 + XX.
Applying a layer of zinc on an article by electroplating is called
Galvanization
Electro refining
Anodizing
Electrolysis
ASSERTION: Silver and gold do not react with oxygen even at high temperatures.
REASON: Silver and gold aren’t reactive metals.
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
Assertion (A) is true but reason (R) is false.
Assertion (A) is false but reason (R) is true.
Arrange the following in correct order :
a. Negative and positive charge meets producing flash of light
b. Air current move upward and water drops move downward
c. Positive charge collect at the top of cloud and negative collects at the bottom
d. Rubbing action between air current and water drops separates charges
a, b, c, d
b, a, c, d
b, d, c, a
a, b, d, c
ASSERTION: Aluminium oxide and zinc oxide are acidic in nature.
REASON: Amphoteric oxides react with both acids and bases.
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
Assertion (A) is true but reason (R) is false.
Assertion (A) is false but reason (R) is true.
Find the odd one out
Amoeba
Entamoeba histolytica
Plasmodium
Kelps
In electroplating a spoon with copper, a sheet of pure copper is used as ___________ whereas in electro - refining sheet of pure copper is used as ___________ respectively.
Anode & Anode
Anode & Cathode
Cathode & Anode
Cathode & Cathode
Metamorphosis in insect is controlled by insect hormones
Thyroxine
Lipid Juvenile Hormone (JH) &20-Hydroxyquinone
20-Hydroxyecdysone & Lipid Juvenile Hormone (JH)
20-Epoxy Ecdysone & Lipid Juvenile Hormone (JH)
Which of these is a classic type of electroscope?
Pitch - Ball Electroscope
Gold - Leaf Electroscope
Silver - Ball Electroscope
None of these
When a sperm having X-chromosome fuses with the ovum, the child born will be
Male
Female
Male as well as Female twin
It depends on the chance of fusion
ASSERTION : Pitch of a note depends upon its displacement from mean position.
REASON : Sound cannot travel through vacuum.
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
Assertion (A) is true but reason (R) is false.
Assertion (A) is false but reason (R) is true.
During lightning which of these is NOT a safe place?
A Bus stop
Inside a house
A Cow shed
A Elevated Ridge
Transfusion of infected blood is main reason for spread of diseases like
AIDS
Hepatitis B
Hepatitis B & AIDS
Polio
Observe figure.
Which of these two circuits A or B shows the correct observation?
Both circuits A & B
Circuit A
Circuit B
Experimental set up doesn't have an electrolyte
