Olympiad Class 7 Science Mock Test Set 05

Question. An object placed 4 m from a plane mirror is shifted by 0.5 m away from the mirror. What is the distance between the object and its image?
(A) 4 m
(B) 3.5 m
(C) 9 m
(D) 5 m
Answer : C

Question. Plastic is coated with melamine to make it
(A) fire proof
(B) strong and flexible.
(C) remouldable.
(D) a good conductor of heat.
Answer : A

Question. The same size image in all positions of the object is obtained by a
(A) plane mirror.
(B) convex mirror.
(C) concave mirror.
(D) cylindrical mirror.
Answer : A

Question. Which of the following exists in crystalline form?
(A) Protozoa
(B) Bacteria
(C) Viruses
(D) Algae
Answer : C

Question. Which force is used by an archer to pull a bow?
(A) Muscular force
(B) Frictional force
(C) Gravitational force
(D) Elastic spring force
Answer : A

Question. Atoms combine through the
(A) interaction of protons
(B) presence of a catalyst
(C) rise in temperature
(D) interaction of electrons
Answer : D

Question. Which fuel is the cleanest ?
(A) CNG
(B) Charcoal
(C) Diesel
(D) Petrol
Answer : A

Question. The streaks of bright light and sound produced during lightning is due to the meeting of
(A) positive charges
(B) like electric charges
(C) negative charges
(D) unlike electric charges
Answer : D

Question. The function of thyroxine hormone in frog is to control the
(A) metabolic rate
(B) metamorphosis
(C) reproductive organs
(D) endocrine glands
Answer : B

Question. What is the calorific value (in kJ/kg) of cow dung cake?
(A) 6000-8000
(B) 17000-22000
(C) 25000-33000
(D) 35000-40000
Answer : A

Question. Which of the following processes occur once a month in an adolescent girl?
(A) Fertilisation
(B) Ovulation
(C) Menstruation
(D) Both (B) and (C)
Answer : D

Question. Metals react with water to form oxides or hydroxides and
(A) hydrogen
(B) oxygen
(C) carbon dioxide
(D) carbon monoxide
Answer : A

Question. How many letters of EXAMINATION word are not changed when the word is seen by reflection in a plane mirror?
(A) 11
(B) 6
(C) 8
(D) 9
Answer : C

Question. What is the number of vibrations made by a body in one second called?
(A) Frequency
(B) Wavelength
(C) Loudness
(D) Pitch
Answer : A

Question. Which of these reproduces by regeneration?
(A) Plasmodium
(B) Amoeba
(C) Euglena
(D) Planaria
Answer : D

Question. The burning of plastic is not permitted as they pollute the environment by releasing
(A) smoke, toxic gases
(B) water vapour, haze
(C) water vapour, smoke
(D) All of the above
Answer : A

Question. Which actions requires both a push and a pull?
(A) Stapling of papers
(B) Pressing the lift button
(C) Closing the door
(D) Painting a wall with rollers
Answer : D

Question. A carrom board is usually powdered before playing for
(A) increasing friction.
(B) decreasing friction.
(C) decoration.
(D) fragrance.
Answer : B

Question. A rock undergoes stress. This stress depends on
(A) its temperature.
(B) how slowly or quickly the stress is applied.
(C) the confining pressure on the rock.
(D) all of the above
Answer : D

Question. Which of these organisms is unicellular, causes fermentation of sugar solutions and respires anerobically?
(A) Rhizopus
(B) Yeast
(C) Amoeba
(D) Bacteria
Answer : B