MCQ for Class 10 Science with Answers
1. In the reaction 2HCl + Na2CO3 → 2NaCl + H2O + CO2, the products are:
a) Sodium chloride and water only
b) Sodium chloride, water, and carbon dioxide
c) Sodium chloride, carbon dioxide, and hydrogen
d) Sodium chloride, hydrogen, and oxygen
Answer: b
2. Which of the following is NOT a characteristic of an acid?
a) Sour taste
b) Turns blue litmus paper red
c) Reacts with a base to form a salt and water
d) Has a pH greater than 7
Answer: d
3. Which of the following is a non-metal?
a) Sodium
b) Oxygen
c) Iron
d) Calcium
Answer: b
4. Which of the following is an organic compound?
a) H2O
b) NaCl
c) CO2
d) C2H6
Answer: d
5. In the periodic table, elements in the same ______ have similar chemical and physical properties.
a) Group
b) Period
c) Series
d) Block
Answer: a
6. The process by which living organisms obtain and use energy from food is called:
a) Respiration
b) Photosynthesis
c) Digestion
d) Transpiration
Answer: a
7. Which of the following is NOT a function of the nervous system?
a) Controlling and coordinating body movements
b) Regulating body temperature
c) Receiving and interpreting information from the environment
d) Responding to stimuli
Answer: b
8. In humans, fertilization occurs in the:
a) Ovary
b) Uterus
c) Fallopian tube
d) Vagina
Answer: c
9. Which of the following is a heritable characteristic?
a) The ability to play a musical instrument
b) The ability to ride a bicycle
c) Eye color
d) Learned behavior
Answer: c
10. The change in the frequency or wavelength of a wave as it passes from one medium to another is called:
a) Diffraction
b) Reflection
c) Refraction
d) Interference
Answer: c
11. The ability of the eye to see objects at different distances is called:
a) Accommodation
b) Refraction
c) Reflection
d) Dispersion
Answer: a
12. A material through which electric current can pass with very little resistance is called a:
a) Conductor
b) Insulator
c) Semiconductor
d) Diode
Answer: a
13. The magnetic field produced by a straight current-carrying wire is:
a) Concentrated in the center of the wire
b) Concentrated around the wire
c) Concentrated at the ends of the wire
d) Non-existent
Answer: b
14. Which of the following is NOT a renewable source of energy?
a) Solar energy
b) Wind energy
c) Fossil fuels
d) Hydroelectric energy
Answer: c
15. Which of the following is an example of non-biodegradable waste?
a) Vegetable peels
b) Paper
c) Plastic bags
d) Fallen leaves
Answer: c
Frequently Asked Questions on Light – Reflection and Refraction
Which mirror can form a real image of an object?
Concave.
The swimming pool appears to be less deep than it actually is. Which of the following phenomena is responsible for this?
Refraction of light.
A 3 cm high object is placed at a distance of 80cm from a concave lens of focal length 20cm. Find the size of the image formed.
0.6 cm
Light – Reflection and Refraction Class 10 MCQs
Q1) When a plane mirror is rotated through a certain angle, the reflected ray turns through twice as much and the size of the image:
(a) is doubled
(b) is halved
(c) becomes infinite
(d) remains the same
Correct Answer: Option (d)
Q2) If an object is placed symmetrically between two plane mirrors, inclined at an angle of 72 degrees, then the total no. of images formed is:
(a) 5
(b) 4
(c) 2
(d) infinite
Correct Answer: Option (b)
Q3) Which statement is true for the reflection of light?
(a) The angle of incidence and reflection are equal.
(b) The reflected light is less bright than the incident light.
(c) The sum of the angle of incidence and reflection is always greater than 900.
(d) The beams of the incident light, after reflection, diverge at unequal angles.
Correct Answer: Option (a)
Q4) The focal length of a plane mirror is
(a) 0
(b) infinite
(c) 25 cm
(d) -25 cm
Correct Answer: Option (b)
Q5) The image shows the path of incident rays to a concave mirror.
Where would the reflected rays meet for the image formation to take place?
(a) Behind the mirror
(b) Between F and O
(c) Between C and F
(d) Beyond C
Correct Answer: Option (c)
Q6) A beam of light incident on a plane mirror forms a real image on reflection. The incident beam is:
(a) parallel
(b) convergent
(c) divergent
(d) not certain
Correct Answer: Option (b)
Q7) An object is placed at a distance of 40cm in front of a concave mirror of a focal length of 20 cm.
The image produced is:
(a) virtual and inverted
(b) real and erect
(c) real, inverted and of the opposite size as that of the object
(d) real, inverted and of the same size as that of the object
Correct Answer: Option (d)
Q8) A student conducts an experiment using a convex lens. He places the object at a distance of 60 cm in front of the lens and observes that the image is formed at a distance of 30 cm behind the lens. What is the power of the lens?
(a) 0.005 dioptre
(b) 0.05 dioptre
(c) 5 dioptre
(d) 50 dioptre
Correct Answer: Option (c)
Q9) An image of an object produced on a screen which is about 36 cm using a convex lens. The image produced is about 3 times the size of the object. What is the size of the object?
(a) 12 cm
(b) 33 cm
(c) 39 cm
(d) 108 cm
Correct Answer: Option (a)
Q10) Image formed by a convex spherical mirror is:
(a) virtual
(b) real
(c) enlarged
(d) inverted
Correct Answer: Option (a)
Q11) A student studies that a convex lens always forms a virtual image irrespective of its position. What causes the convex mirror to always form a virtual image?
(a) Because the reflected ray never intersects
(b) Because the reflected ray converges at a single point
(c) Because the incident ray traces its path back along the principal axis
(d) Because the incident ray of a convex mirror gets absorbed in the mirror
Correct Answer: Option (a)
Q12) A 10 mm long awl pin is placed vertically in front pin is formed at 30cm in front of the mirror. The focal length of this mirror is:
(a) -30 cm
(b) -20 cm
(c) -40 cm
(d) -60 cm
Correct Answer: Option (b)
Q13) Rahul conducts an experiment using an object of height of 10 cm and a concave lens with a focal length of 20 cm. The object is placed at a distance of 25 cm from the lens. Can the image be formed on a screen?
(a) Yes, as the image formed will be real
(b) Yes, as the image formed will be erect
(c) No, as the image formed will be virtual
(d) No, as the image formed will be inverted
Correct Answer: Option (c)
Q14) Magnification produced by a rearview mirror fitted in vehicles:
(a) is less than one
(b) is more than one
(c) is equal to one
(d) can be more than or less than one, depending upon the position of the object in front of it
Correct Answer: Option (a)
Q15) A student conducts an activity using a concave mirror with a focal length of 10 cm. He placed the object 15 cm from the mirror. Where is the image likely to form?
(a) At 6 cm behind the mirror
(b) At 30 cm behind the mirror
(c) At 6 cm in front of the mirror
(d) At 30 cm in front of the mirror
Correct Answer: Option (d)
Q16) The image of an object placed in front of a convex mirror is formed at
(a) the object itself
(b) twice the distance of the object in front of the mirror
(c) half the distance of the object in front of the mirror
(d) behind the mirror
Correct Answer: Option (d)
Q17) A full length of the image of a distant tall building can definitely be seen using:
(a) a concave mirror
(b) a convex mirror
(c) a plane mirror
(d) both concave as well as plane mirrors
Correct Answer: Option (b)
Q18) A student conducts an activity using a flask of height 15 cm and a concave mirror. He finds that the image formed is 45 cm in height. What is the magnification of the image?
(a) -3 times
(b) -1/ 3 times
(c) 1/ 3 times
(d) 3 times
Correct Answer: Option (d)
Q19) Which of the following can make a parallel beam of light from a point source incident on it?
(a) Concave mirror as well as convex lens
(b) Convex mirror as well as concave lens
(c) Two plane mirrors placed at 90degree to each other
(d) Concave mirror as well as concave lens
Correct Answer: Option (a)
Q20) A student studies that the speed of light in air is 300000 km/sec, whereas that of speed in a glass slab is about 197000 km/sec. What causes the difference in the speed of light in these two media?
(a) Difference in density
(b) Difference in temperature
(c) Difference in the amount of light
(d) Difference in the direction of wind flow
Correct Answer: Option (a)
CBSE Class 10 Science MCQ Chapter 12 Electricity with Answers
Q1) The image shows a circuit diagram.
What is being measured using the voltmeter?
(a) Current in the circuit
(b) Voltage in the circuit
(c) The voltage across the resistor
(d) The resistance offered by the resistor
Correct Answer: Option (c)
Q2) The least resistance obtained by using 2 Ω, 4 Ω, 1 Ω and 100 Ω is
(a) < 100 Ω
(b) < 4 Ω
(c) < 1 Ω
(d) > 2 Ω
Correct Answer: Option (c)
Q3) Work of 14 J is done to move 2 C charge between two points on a conducting wire. What is the potential difference between the two points?
(a) 28 V
(b) 14 V
(c) 7 V
(d) 3.5 V
Correct Answer: Option (c)
Q4) A fuse wire repeatedly gets burnt when used with a good heater. It is advised to use a fuse wire of
(a) More length
(b) Less radius
(c) Less length
(d) More radius
Correct Answer: Option (d)
Q5) A circuit has a charge of 2C moving through it in 3 s. Which electrical component in the circuit, if present, will show the current?
(a) Voltmeter will show a current of 6 A
(b) Ammeter will show a current of 0.7 A
(c) Rheostat will show a current of 0.7 A
(d) Resistor will show a current of 0.35 A
Correct Answer: Option (b)
Q6) Electrical resistivity of a given metallic wire depends upon
(a) Its length
(b) Its thickness
(c) Its shape
(d) Nature of the material
Correct Answer: Option (d)
Q7) Two devices are connected between two points, say A and B, in parallel. The physical quantity that will remain the same between the two points is
(a) Current
(b) Voltage
(c) Resistance
(d) None of these
Correct Answer: Option (b)
Q8) Unit of electric power may also be expressed as
(a) Volt-ampere
(b) Kilowatt-hour
(c) Watt second
(d) Joule second
Correct Answer: Option (b)
Q9) What is the relationship between resistance and current?
(a) They are directly related to each other
(b) They are inversely related to each other
(c) The resistance has a greater magnitude than the current
(d) The current has a greater magnitude than the resistance
Correct Answer: Option (b)
Q10) The resistance whose V – I graph is given below is
(a) 5/3 Ω
(b) 3/5 Ω
(c) 5/2 Ω
(d) 2/5 Ω
Correct Answer: Option (b)
Q11) A current of 1 A is drawn by a filament of an electric bulb. The number of electrons passing through a cross-section of the filament in 16 seconds would be roughly
(a) 1020
(b) 1016
(c) 1018
(d) 1023
Correct Answer: Option (a)
Q12) How much more heat is produced if the current is doubled?
(a) Twice the original amount
(b) Thrice the original amount
(c) Four times the original amount
(d) Five times the original amount
Correct Answer: Option (c)
Q13) Which of the following represents voltage?
(a) Work done / Current × Time
(b) Work done × Charge
(c) Work done × Time / Current
(d) Work done × Charge × Time
Correct Answer: Option (a)
Q14) A cooler of 1500 W, 200 volts and a fan of 500 W, 200 volts are to be used from a household supply. The rating of the fuse to be used is
(a) 2.5 A
(b) 5.0 A
(c) 7.5 A
(d) 10 A
Correct Answer: Option (d)
Q15) Which combination of a 2 Ω resistor and 4 Ω resistor offers the least resistance to current in the circuit?
(a) Series combination, which results in a net resistance of 2 Ω
(b) Parallel combination, which results in a net resistance of 2 Ω
(c) Series combination, which results in a net resistance of 1.5 Ω
(d) Parallel combination, which results in a net resistance of 0.5 Ω
Correct Answer: Option (d)
Q16) In an electrical circuit, two resistors of 2 Ω and 4 Ω, respectively, are connected in series to a 6 V battery. The heat dissipated by the 4 Ω resistor in 5 s will be
(a) 5 J
(b) 10 J
(c) 20 J
(d) 30 J
Correct Answer: Option (c)
Q17) In order to reduce electricity consumption at home, what kind of appliance should one purchase?
(a) One which draws low power
(b) One which produces less heat
(c) One which operates at a higher voltage
(d) One which draws a high amount of current
Correct Answer: Option (a)
Q18) If n resistors each of resistance R are connected in parallel combination, then their equivalent resistance is
(a) R/n2
(b) n2/R
(c) n/R
(d) R/n
Correct Answer: Option (d)
Q19) Which one among a bar of an alloy of mass 2 kg and a 3 kg iron bar of the same dimension has greater resistivity?
(a) Iron bar because it has a higher mass
(b) Alloy bar because it has a lower mass
(c) Iron bar because it has the same types of atoms
(d) Alloy bar because it has different types of atoms
Correct Answer: Option (d)
Q20) Two resistors connected in series give an equivalent resistance of 10 Ω. When connected in parallel, give 2.4 Ω. Then the individual resistance is
(a) each of 5 Ω
(b) 6 Ω and 4 Ω
(c) 7 Ω and 4 Ω
(d) 8 Ω and 2 Ω
Correct Answer: Option (b)
Q21) A battery of 10 volt carries 20,000 C of charge through a resistance of 20 Ω. The work done in 10 seconds is
(a) 2 × 103 joule
(b) 2 × 105 joule
(c) 2 × 104 joule
(d) 2 × 102 joule
Correct Answer: Option (b)
Q22) Two bulbs are rated 40W, 220W and 60W, 220W. The ratio of their resistances will be
(a) 4:3
(b) 3:4
(c) 2:3
(d) 3:2
Correct Answer: Option (d)
Q23) The image shows a combination of 4 resistors.
What is the net resistance between the two points in the circuit?
(a) 0.5 Ω
(b) 1.0 Ω
(c) 1.5 Ω
(d) 2.0 Ω
Correct Answer: Option (b)
Q24) If R1 and R2 be the resistance of the filament of 40 W and 60 W, respectively, operating 220 V, then
(a) R1 < R2
(b) R2 < R1
(c) R1 = R2
(d) R1 ≥ R2
Correct Answer: Option (b)
Q25) An electric toaster has a power rating of 200 W. It operates for 1 hour in the morning and 1 hour in the evening. How much does it cost to operate the toaster for 10 days at Rs. 5 per kW h?
(a) Rs. 20
(b) Rs. 400
(c) Rs. 5000
(d) Rs. 10000
Correct Answer: Option (a)
Q26) A coil in the heater consumes power P on passing current. If it is cut into halves and joined in parallel, it will consume power
(a) P
(b) P/2
(c) 2 P
(d) 4 P
Correct Answer: Option (d)
Q27) Calculate the current flow through the 10 Ω resistor in the following circuit.
(a) 1.2 A
(b) 0.6 A
(c) 0.2 A
(d) 2.0 A
Correct Answer: Option (b)
Q28) The effective resistance between A and B is
(a) 4 Ω
(b) 6 Ω
(c) May be 10 Ω
(d) Must be 10 Ω
Correct Answer: Option (a)
Q29) In this question, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:
Assertion: In an open circuit, the current passes from one terminal of the electric cell to another.
Reason: Generally, the metal disc of a cell acts as a positive terminal.
(a) Both the Assertion and the Reason are correct, and the Reason is the correct explanation of the Assertion.
(b) The Assertion and the Reason are correct, but the Reason is not the correct explanation of the Assertion.
(c) Assertion is true, but the Reason is false.
(d) The statement of the Assertion is false, but the Reason is true.
Correct Answer: Option (d)
