List of practice Questions

In some members of which of the following pairs of families, pollen grains retain their viability for months after release

Which of the following statements is correct?

The number of photons per second on average emitted by the source of monochromatic light of wavelength 600 nm, when it delivers the power of 3.3×10⁻³ watt will be : (h=6.6×10⁻³⁴ Js)

An infinitely long straight conductor carries a current of 5 A as shown. An electron is moving with a speed of 10⁵ m/s parallel to the conductor. The perpendicular distance between the electron and the conductor is 20 cm at an instant. Calculate the magnitude of the force experienced by the electron at that instant

The half-life of a radioactive nuclide is 100 hours. The fraction of original activity that will remain after 150 hours would be

If $E$ and $G$ respectively denote energy and gravitational constant, then $\frac{ E }{ G }$ has the dimensions of:

If force $[ F ]$, acceleration $[ A ]$ and time $[ T ]$ are chosen as the fundamental physical quantities. Find the dimensions of energy.

An object is placed at a certain distance on the principal axis of a concave mirror. If the image distance (v) is 30 cm and radius of curvature (R) of the mirror is 20 cm, find the object distance (u)

If magnification is equal to one, it means

If a light ray passing through centre of curvature (C) of a mirror is incident on the mirror, the reflected ray's path is

When distance between object and screen is more than 4 times the focal length, in how many positions of the convex lens, image is sharp ?

If object and image lie on the same side of a mirror, the mirror is

Focal plane of a spherical mirror is

When a set of parallel rays of light inclined at 15° to the principal axis, are incident on a convex lens, they

To find normal to a curved surface at a point, join that point and

H.C.F. of 8, 9 and 25 is______

What is the degree of the polynomial \(7u^6 - \frac{3}{2}u^4 + 6u^2 - 8\) ?

The zeroes of the quadratic polynomial \(x^2+24x+119\) are

Cardinal number of the set A={-2, -1,0,1,2} is

The value of loge \(e{\sqrt{e}}\) is

If the area of the parallelogram with \(\vec{a}\) and \(\vec{b}\) as two adjacent sides is 15 sq.units then the area of the parallelogram having \(3\vec{a}+2\vec{b}\) and \(\vec{a}+3\vec{b}\) as two adjacent sides in sq.units is

Three persons enter into a partnership by investing in the ratio of 9:8:1. After one year P double his investment and R puts another Rs.6000 to the initial investment. Now the ratio of investment is 9:8:2. What is total investment of P,Q and R after 2 years?

A transistor amplifier along with a tank circuit with positive feedback will act as

In p-type semiconductors