PHYSICS SAMPLE MCQ QUESTION CLASS XI

Q.1. The least count, of a conventional laboratory vernier caliper, is 0.01 cm. If, in a given measurement, the main scale reading is 2.4 cm and the 5th division of the vernier scale coincides with a main scale decision, the reading of the vernier caliper is :

(a) 2.35 cm

(c) 2.45 cm

(b) 2.40 cm

(d) 2.50 cm

Ans- (c) 

Q.2. A student uses a tuning fork of frequency n and observes the first resonance position, for a length 1 of the air column. The velocity of sound, in air, is then equal to :

(a) n!

(c) 3n!

(b) 2n!

(d) 4n!

Ans-(d) 

Q.3. The diameter of a very thin wire is to be measured by finding the thickness of a collection of, say 10, of these wires. The instrument, that should be preferred for this purpose, is a :

(a) measuring tape

(c) screw gauge

(b) vernier callipers

(d) meter scale

Ans-(c) 

Q.4. The ratio of the spring constant of two springs, of the same material and diameter, is 2:3. If 100 grams mass on is suspended both the springs, the ratio of the extension in the two springs, would be :

(a) 2:3

(c) 4:9

(b) 3:2

(d) 9:4

Ans-(b) 

Q.5. In the experiment, on finding the weight of a given body bythe parallelogram law of vectors, the student needs to use :

(a) Two pulleys and three weights in all

(b) Three pulleys and two weights in all

(c) Two pulleys and two weights in all

(d) Three pulleys and two weights in all

Ans- (a)

Q.6. The sliding 'jaws' of vernier calipers can be used for :

(a) Measuring the depth of a beaker

(b) Measuring the length of a wire

(c) Measuring the internal diameter of a hollow cylinder

(d) Measuring the diameter of a sphere

Ans- (d) 

Q.7. In the experiment of a beam balance, a metallic bob is placed in one of the pan and it gets balanced by putting the weights 50 g, 1 g, 200 mg and 1 mg. The mass of the bob is :

(a) 51.201 g

(c) 49.199 g

(b) 51.210 g

(d) 49.190 g

Ans-(a)

Q.8. In the sonometer experiment, the tension is made four time without changing the length. The frequency of the length of the vibrating wire, would :

(a) remain same

(b) become two times in its earlier value

(c) reduce the half its (earlier) value

Ans- (b) 

Q.9. The first 'resonance position' in a resonance tube apparatus, is observed to be for a length of 720 cm of its air column. The length of the air column for the second 'resonance position' in this sit up, would be nearly :

(a) 30 cm

(c) 50 cm

(b) 40 cm

(d) 60 cm

Ans-(d)

Q.10. The vernier scale of a microscope has 50 divisions. These coincide with 49 divisions on its main scale, which is graduated up to ½ of a mm. The least count of the vernier scale would be :

(a) 1/50 mm

(c) 49/50 mm

(b) 1/100 mm

(d) 49/100

Ans-(b) 

Q.11. In the experiment on finding the unknown weight, using the parallelogram law of vectors, the student should :

(a) lubricate the pulleys and use a cotton thread

(b) lubricate the pulleys and use a woollen thread

(c) not lubricate the pulleys and use a cotton thread

(d) not lubricate the pulleys and use a woollen thread

Ans- (a)

Q.12. The wire of a sonometer is made to vibrate by :

(a) plucking it

(c) sliding a bow on it

b) striking it with a hammer

(d) touching it with a vibrating tuning fork

Ans- (a)

Q.13. A student measures the time period values (T) of a simple pendulum for, different values of its length (L). The graph between the 'L' and 'T' values, would be

(a) a straight line parallel to the 'length' axis

(b) a straight line parallel to the 'time' axis

(c) a straight line inclined to both the axis

(b) not a straight line but a curved line

Ans-(d)

Q.14. A student observes that a tuning fork of frequency 256 Hz, shows resonance with a sonometer wire when the weight attached to the sonometer wire is W kg and the length of the wire between the wedges if L cm. For observing resonance, with the same set up, with a tuning fork of frequency 512 Hz, the length between the wedges would need to be adjusted to :

(a) L/4

(c) 2L

(b) L/2

(d) 4L

Ans- (b)

Q.15. Give vernier calipers has a zero error of + 0.44 cm. The diameter of a rod, as read by this vernier, is 1.24 cm. The corrected diameter of the rod is :

(a) 1.20 cm

(c) 1.28 mm

(b) 1.20 mm

(d) 1.28 cm

Ans-(a)

Q.16. A carpenter, while driving a screw through a wooden block, of thickness 1 cm, observe that he has to rotate the screw 10 times for the purpose. The pitch of the screw is :

(a) 1/100 cm

(c) 1 cm

(b) 1/10 cm

(d) 10 cm

Ans- (b)

Q.17. The two arms of a defective physical balance have lengths a and b (a < b). A metallic bob of mass m1 is placed in the pan on the shorter arm and it gets balanced by putting a mass m2 in the longer arm. We would then have :

(a) m1a = m2b

(c) m1 + m2 = a + b

b) m1b = m1a

(d) m2 – m1 = b – a

Ans- (a)

Q.18. In the resonance tube apparatus set up, the first two resonance positions are observed for length l1 and lof the air column. A graph between l1 and l2 values, for different tuning forks, would be :

(a) a straight line that, when produced, would (almost) pass through the origin

(b) a straight line that, when produced, would not pass through the origin

(c) almost a parabolic curve

(d) an arbitrary curved line

Ans- (a)

Q.19. The length of a given helical spring is observed to increase by 1 cm when a mass of 100 g is attached to its lower end. If g = 10 m/s2, the force constant of the spring equals :

(a) 1000 N/m

(c) 10 Nm–1

(b) 100 Nm–1

(d) 1 N/m

Ans- (b)

Q.20. A student measures the time period (T) of a simple pendulum for different values of its length (L). The student would get a straight line by plotting a graph between :

(a) 'L' and 'T' values

(c) L and √T values

(b) '√L' and 'T' values

(d) √L and √T values

Ans-(b)

Q.21. Backlash error is usually associated with a :

(a) meter scale

(c) Screw gauge

(b) Vernier caliper

(d) Helical spring

Ans-(c)

Q.22. The minimum weights, available in the main 'weight box' and the 'fractional weight box', commonly used in the laboratory are, respectively :

(a) 1 g and 1 mg

(c) 10 g and 1 mg

(b) 1 mm and 1 g

(d) 10 mg and 1 g

Ans-(a)

Q.23. In the experiment on finding the weight of a given body by the parallelogram law of vector, a student observes that he can find the unknown weight by using two equal weights of 100 g each. The unknown weight is likely to have a value of (nearly) :

(a) 500 g wt

(c) 100√2 g wt

(b) 200 g wt

(d) 100 g wt

Ans-(c)

Q.24. The pendulum, in a wall clock, is a 'seconds pendulum', i.e., has a time period of 2s. The 'effective length' of a simple pendulum, that has the same time period, is nearly :

(a) 50 cm

(c) 150 cm

(b) 100 cm

(d) 200 cm

Ans- (b)

Q.25. The force constant, of a helical spring, is to be increased. For this, spring should be made :

(a) strong and thick

(c) soft and thick

(b) strong and thin

(d) soft and thin

Ans- (a)

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