Three of the following four figure pairs are alike in

Which lens is used to correct myopia (shortsightedness)?  

Which instrument is used to measure electric current?  

A nucleus with mass number A and atomic number Z undergoes β⁻ decay. Which of the following is correct about the daughter nucleus?

A non-conducting sphere of radius R has a radially varying charge density ρ(r) = k•r. Find the electric field at a distance r < R.

Specific resistance of a conductor increases with :

In a closed organ pipe, the frequencies of vibration are in the ratio:

A silicon sample is doped such that the number of holes far exceeds the number of electrons. Which of the following is true about its conductivity?

Newton's rings can be obtained in:

The stress–strain graph for two wires A and B is shown. Wire A has a steeper linear region than B. This indicates that:

Which gate gives a high output only when both inputs are low?