Physics-Units, Dimensions and Measurement , NEET question paper PDF

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Physics question paper for Entrance exam...

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PHYSICS - UNITS, DIMENSIONS AND MEASUREMENTS REPEAT: ONLINE BOOKLET SERIES – A 1.

2.

3.

4.

5.

6.

7.

TIME : 30 Minutes

12 12--10-2021

The percentage errors in the measurement of mass and speed are 2% and 3% respectively. How much will be the maximum error in the estimation of the kinetic energy obtained by measuring mass and speed (1) 11% (2) 8% (3) 5% (4) 1% The vernier scale of a traveling microscope has 50 divisions which coincide with 49 main scale divisions. If each main scale division is 0.5 mm, calculate the minimum inaccuracy in the measurement of distance. (1) 0.02 mm (2) 0.07 mm (3) 0.01 mm (4) 0.05 mm Error in the measurement of radius of a sphere is 1%. The error in the calculated value of its volume is (1) 1% (2) 3% (3) 5% (4) 7% The mean time period of second's pendulum is 2.00s and mean absolute error in the time period is 0.05s. To express maximum estimate of error, the time period should be written as (1) (2.00  0.01) s (2) (2.00 +0.025) s (3) (2.00  0.05) s (4) (2.00  0.10) s The unit of percentage error is (1) Same as that of physical quantity (2) Different from that of physical quantity (3) Percentage error is unit less (4) Errors have got their own units which are different from that of physical quantity measured The smallest value that can be measured by the measuring instrument is called (1) Least count (2) count (3) least count error (4) either (2) or (3) A thin copper wire of length l metre increases in length by 2% when heated through 10ºC. What is the percentage increase in area when a square copper sheet of length l metre is heated through 10ºC (1) 4% (2) 8% (3) 16% (4) None of the above

8.

Score: 60 A physical parameter a can be determined by measuring the parameters b, c, d and e using the relation a = b c  / d  e  . If the maximum errors in the measurement of b, c, d and e are b 1 %, c 1 %, d 1 % and e 1 %, then the maximum error in the value of a determined by the experiment is (1) ( b1 + c1 + d1 + e1 )% (2) ( b1 + c 1 − d1 − e 1 )% (3) ( b1 + c1 − d1 − e1 )% (4) ( b1 + c1 + d1 + e1 )%

9.

10.

The period of oscillation of a simple pendulum in the experiment is recorded as 2.63 s, 2.56 s, 2.42 s, 2.71 s and 2.80 s respectively. The average absolute error is (1) 0.1 s

(2) 0.11 s

(3) 0.01 s

(4) 1.0 s

Find the relative error is Z, if Z = A 4B1/3 / CD3/2 . (1)

4  A  1   B   C  3  D   +  +  +   5  B  3 B   C  2  D 

 B  1  A   C  3  D  (2) 4  +  + +   B  3 A 

 C  2 D 

 A  1   B   C  3  D  (3) 4  +  + +   A  3 B 

 C  2 D 

  A  1  B    C  3  D  +   + +    B  3  B   C  2 D 

(4) 2 11.

According to Joule's law of heating, heat produced H = I 2 Rt, where I is current, R is resistance and t is time. If the errors in the measurement of I, R and t are 3%, 4% and 6% respectively then error in the measurement of H is (1)  17% (2)  16% (3)  19% (4)

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 25%

RPT /A

1

12.

A physical quantity P is given by P=

A3 B2 3

.

C− 4 D2

The quantity which brings in the maximum percentage error in P is (1) A (2) B (3) C 13.

14.

(4) D

If the length of rod A is 3.25  0.01 cm and that of B is 4.19  0.01 cm then the rod B is longer than rod A by (1)0.94  0.00 cm (2) 0.94  0.01 cm (3)0.94  0.02 cm (4) 0.94  0.005 cm A physical quantity is given by X = M a Lb T c . The percentage error in measurement of M, L and T are ,  and  respectively. Then maximum percentage error in the quantity X is (1) a  + b  + c (3)

15.

a



+

b



+

c

(2)

a + b  − c

(4) None of these



A physical quantity A is related to four observable

a, b , c

and d as follows, A =

a 2b 3 c d

, the

percentage errors of measurement in a, b , c and d are 1%, 3% ,2% and 2% respectively. What is the percentage error in the quantity A (1) 12% (3) 5%

(2) 7% (4) 14%

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[*Duplicating this Content Prohibited. All Rights Reserved to Platinum Classes, Perinthalmanna]

RPT /A...