In which of the following instrument used in the lab there exists an error of random category known as back lash error
(i) Screw gauge (ii) Micrometer (iii) Vernier calipers

Which one of the following intruments is not used for the measurement of length? Atomic clock vernier callipers Screw gauge Spherometer

Identify the quantifers used in the following statements and write the negation of the statements : (i) there exists a number which is equal to its cube. (ii) for all states in india, there is a capital in india. (iii) there exists a man whose age is 150 years. (iv) all students are of 25 years or more.

Which of the following chemicals are used to manufacture methy1 isocyanate that caused Bhopal Tragedy ? (i)Methylamine (ii) Phosgene (iii) Phosphine (iv) Dimethylamine .

Identify the quantifier in the following statements and write the negation of the statements.(i) There exists a number which is equal to its square.(ii) For every real number x, x is less than x + 1 .(iii) There exists a capital for every state in india.

The random error which exists invariably in screw gause

Which of the following is the most precise device for measuring length (i) a vernier calipers with 20 divisions on the sliding scale (ii) a screw gauge of pitch Imm and 100 divisions on the circular scale (iii) an optical instrument that can measure length to within a wavelength of light?

The meehanism behind nut and bolt arrangement also works for screw gauge. In case of nut and bolt mechanism, with rotation of bolt, it has translational movement also. In one complete rotation of bolt, tip of bolt moves by a linear distance equal to linear distance between two consecutive threads on the screw, known as pitch in case of screw gauge, the circular scale is divided in several parths. The ratio of pitch and total number of divisions on circular scale is known as least count. Spherometer is a device used to measure very small distances such as radius of curvature and thicness of thin plate. The screw gauge can be used to meaure diameter of a spherical sample. A screw gauge has 100 divisions on head scale and in 8 rotations distance covered is 8 mm. A screw gauge has which of the following characteristics ?

Which of the following statements describe natural extinction ? (i) Extinctions abetted by human activities (ii) Slow replacement of existing species (iii) Also known as background extinction (iv) A small population is most likely to be extinct (a) (i) and (ii) (b) (i), (ii) and (iii) (c) (ii), (iii) and (iv) (d) (i), (ii), (iii) and (iv)

Which of the following statements are correct? (i) Species is basic unit of classification in taxonomy. (ii) There is no suffix for genus, species & kingdom. (iii) Domain is a super kingdom category. (iv) Order is placed between division and class in taxonomic hierarchy.