If 100 J of work is done to move electric charge equal to 4 C from a place where potential difference is \( -10 \text{ V} \) to another place where potential is V volt, then the value of V would be:

Which of the following statements are true regarding alternating current:
(A) In an a.c. circuit containing resistance only, a.c. power is expressed in the same form as d.c. power (\( P = I^2 R \)), using a special value of current called root mean square (rms) or effective current, denoted by \( I_{rms} \).
(B) A phasor is a vector.
(C) Resonance phenomenon is exhibited by a circuit even if both L and C are not present in the circuit.
(D) For circuits used for transporting electric power, a low power factor implies less power loss in transmission.
Choose the correct answer from the options given below:

When a convex lens of glass is immersed in water, its power will

What physical quantity is the same for X-rays of wavelength \( 10^{-10} \) m, red light of wavelength 680 nm and radiowaves of wavelength 50 m?

The wavelength of matter wave for a moving charged particle is independent of

A freshly prepared radioactive sample of half life 1 hour emits radiations that are 128 times as intense as the permissible safe limit. What is the minimum time after which the sample can be safely used?

For fixed radii of curvature of a lens, power is proportional to :

Match List-l with List-II

List-I (Common Name)	List-II (IUPAC Name)
(A) Diisopropyl ketone	(I) 2-Methylpropanal
(B) Isobutyraldehyde	(II) Prop-2-enal
(C) Phthaldehyde	(III) 2,4-Dimethylpentan-3-one
(D) Acrolein	(IV) Benzene-1,2-dicarbaldehyde

Choose the correct answer from the options given below:

When a dielectric material placed in uniform electric field, which of the following option is NOT CORRECT:

Chromosomes 'Z' and 'W' for sex determination are seen in :

The general solution of the differential equation \(e^x d y+\left(y e^x+2 x\right) d x=0\) is

Read the passage carefully. Attempt the questions.
An overwhelming majority (99 per cent) of animals and nearly all plants cannot maintain a constant internal environment. Their body temperature changes with the ambient temperature. In aquatic animals, the osmotic concentration of the body fluids change with that of the ambient air and water osmotic concentration. These animals and plants are simply conformers. Considering the benefits of a constant internal environment to the organism, we must ask why these conformers had not evolved to become regulators. Recall the human analogy we used above; much as they like, how many people can really afford an air conditioner? Many simply 'sweat it out' and resign themselves to suboptimal performance in hot summer months. Very small animals are rarely found in polar regions. During the course of evolution, the costs and benefits of maintainin a constant internal environment are taken into consideration. Some species have evolved the ability to regulate, but only over a limited range of environmental conditions, beyond which they simply conform.
If the stressful external conditions are localised or remain only for a short duration, the organism has five other alternatives for survival.
Conformers are the animals whose body temperature:

A charge q is enclosed by a Gaussian spherical surface of radius R. If the radius is reduced to half of R, the outward electric flux will be