PHY191 Email: bbcnoun@gmail.com Whatsapp: 08131667008 PHY191 TMA3 10/10 1).The dimension of a rectangular shape is 5.9 by 4.1mm s measured with a veneer calliper whose minimum scale is 0.05 mm. The percentage error in its surface area is approximately. (A)0.0033 (B)0.11 (C)0.002 (D)0.03 Ans: 0.11 2).In an experiment, the readings are repeated so as to overcome? (A)zero error (B)systematic error (C)instrument error (D)random error Ans: random error 3).Which of the following is not a necessary precaution while performing an experiment on measurement of length? (A)Avoid parallax error (B)Close windows to avoid air current. (C)Avoid zero error. (D)repeat the measurement Ans: Close windows to avoid air current. 4).Two separate experiments were performed to determine acceleration of gravity at a point on the surface of the earth. The values and their standard errors are 9.81 ± 0.02 and 9.85 ± 0.01 (m/s2). Hence, the error causing the difference is from which source? (A)Random (B)Erratic (C)Maximum (D)Systematic Ans: Random 5).A substance of mass 0.4kg having a density 2700kg/m3 occupies an area 0.02m2. Determine the thickness of the substance. (A)0.074m (B)0.74m (C)7.4m (D)0.0074m Ans: 0.0074m 6).A set of readings that are close to one another is said to be (A)accurate (B)precise (C)concise (D)real Ans: precise 7).A set of measurement is said to be accurate if it the systematic error in it is (A)large (B)small (C)infinite (D)zero. Ans: small 8).Which of the following error is likely to occur when the jaw of the fixed major scale of a vernier calliper are not closed tightly together? (A)parallax error (B)zero error (C)random error (D)erratic error Ans: zero error 9).Which instrument would you recommend as the best and most appropriate and to a student in the measurement of the diameter of a metal rod. (A)Meter rule (B)Vernier Callipers (C)Micrometer screw guage (D)Travelling Microscope Ans: Micrometer screw guage 10).Which of these statements is NOT CORRECT about erratic errors? (A)They affect experiment irregularly (B)They have wide range that can not be corrected easily (C)They can be predicted (D)They can arise from faulty instrument Ans: They can be predicted The total kinetic energy possessed by cylinder rolling down an inclined plane given as Answer: â1/2mv2 + a1/2iw2 The dimension of a rectangular shape is 5.9 by 4.1mm s measured with a veneer calliper whose minimum scale is 0.05 mm. The percentage error in its surface area is approximately. Answer: 0.11 If a plane is inclined at an angle 5o with the horizontal and a cylindrical metal is allowed to roll between two fixed height 92cm apart on the plane. Given that the acceleration of the cylinder to be (2gSinW3) and g as 9.8m/s2, the time of descent i Answer: 1.809 secs Six measurements were made of the time in seconds for 20 oscillations of a mass hung from a spiral spring as follows: 20.1,20.2, 20.3, 20.1, 20.0, 20.2.The standard error is Answer: 2.5x10-3 Which of these statements is NOT CORRECT about erratic errors? Answer: they can be predicted A substance of mass 0.4kg having a density 2700kg/m3 occupies an area 0.02m2. Determine the thickness of the substance. Answer: 0.0074m Which of the following error is likely to occur when the jaw of the fixed major scale of a vernier calliper are not closed tightly together? Answer: zero error Which of the following is not a necessary precaution while performing an experiment on measurement of length? Answer: close windows to avoid air current. In an experiment, the readings are repeated so as to overcome? Answer: random error Which instrument would you recommend as the best and most appropriate and to a student in the measurement of the diameter of a metal rod. Answer: micrometer screw guage rolling cylinder at the upper fixed point on the inclined plane possesses Answer: potential energy A set of readings that is close to the “true valueâ€? is said to be Answer: accurate Six measurements were made of the time in seconds for 20 oscillations of a mass hung from a spiral spring as follows: 20.1,20.2, 20.3, 20.1, 20.0, 20.2. The mean value of the period of oscillation is Answer: 1.0075 A set of readings that are close to one another is said to be Answer: precise A rolling cylinder is in a motion of two types namely, Answer: translational & rotational The type of error present if three or more observers carrying out an experiment separately and using the same set of instruments obtained different sets of values is Answer: random error If the time of descent of a rolling cylinder on a plane inclined 10o to the horizontal is 3.35 seconds. What is the distance covered by the rolling cylinder, if the acceleration of the cylinder is given as (2gSinî/3)? [Take g = 10 m/s2]. Answer: 649cm Email: bbcnoun@gmail.com Whatsapp: 08131667008