CSIR NET Earth Science Mock Test - 4 Free Online Test 2026

The most sensitive instrument for magnetic survey is

A string of diameter Imm is kept on a table in the shape of a close flat spiral i.e. a spiral with no gap between the turns. The area of the table occupied by the spiral is 1 m². Then the length of the string is

A person travels one fourth of his distance with 20 km/hr, half of the distance with 40 km/hr and the rest of the distance with 10 km/hr. What is his average speed throughout the journey?

There is an inner circle and an outer circle around a square. What is the ratio of the area of the outer circle to that of the inner circle?

What is the thickness of the crust under the mountainous areas and in particular the Himalayas?

Minerals like Orthoclase and Felspar undergo which method of chemical decomposition?

Which of the following is reduction?

The depth at which the Mohorovicic discontinuity occurs is

Compared to clay fine grained sandstone has

Urbanization does NOT lead to

Thermal plumes formed in the mantle ascend upward due to

A sedimentary rock included fossils of two species that are known to have lived between 680-630 and 650-350 million years age. What could be the age of the rock?

Surface chlorophyll concentration during a bloom in the Arabian Sea is 1.5 μg/L. Assuming chlorophyll concentration to be the same throughout the column, what is the column integrated chlorophyll concentration, if the column depth is 45m?

Ni has the most tightly bound nucleus because it

Horsts and grabens are believed to occur due to

The open joints are gradually enlarged due to

The cause of folding which does not occur due to the tangential stresses is

How many groups are classified based on presence of regularities?

Where is the branching digitate outline of a delta (e.g.Mississippi delta) found?

In the generalized concentrations of scavenged, recycled and major elements are A, B and C, respectively, then

Consider an imaginary earth model of thick fluid core surrounded by a thick mantle and thin or no crist. The density in the mantle increases from 3.0 gm/cc at the surface to 5.0 gm/cc at the core -mantle boundary, and it abruptly increases to 10.0 gm/cc in the care. The velocity of the P wave, increase from 3.0 km/sec to 8.0 km/sec in the mantle, and is abruptly falls to 4.0 km/sec in the core. Direct P waves omanating from an earthquake at angles of incidence less than sin^-3(3/16) cannot be received anywhere on the earth's surface. Further the time of arrival of the P wave increases at a rate of 250 sec/radian prior to the onset of shadow zone,

The radius of the core is,

Read the following statements about Koppen's and Thornthwaite's classification schemes and choose the correct answer:
i. Both the schemes are empirical
ii. Thormthwaite used many of the same alphabetic symbols that Koppen used
ii. in both the schemes, vegetation is the basis for the identification of climate types
iv. Thornthwaite's system uses the important concept of evaporation.

Lax theorem state that for a well-posed initial value problem, the condition for a finite-difference scheme to converge to true solution is

The {hkl} form of this crystal is

Assuming the aerosol particles are distributed as per lunge distribution in the atmosphere, the ratio of number of particles of size 0.2 um to 0.6 um is

If the fresh water discharges from Himalayan and Peninsular rivers are drastically reduced, which of the following is unlikely to happen in the Bay of Bengal?

In a productive ocean surface water pH is 8.3 and deep water pH is 7.8, What is the surface:deep H ion activity ratio?

The tropical easterly jet stream is seen during the South-west Indian monsoon season. Which one of the following statements related to the tropical easterly jet stream is false?

The effects of calcrete layer are:

Mississippi valley type deposit is