Choose the right answer from the following
A diminished virtual image can be formed only in Concave Mirror Convex Mirror Plane Mirror Concave-parabolic Mirror Answer: Option 2... View Article
Latest Posts
A soap bubble is given anegative charge, then its radius[MNR 1988; CPMT 1997; RPMT 1997;DCE 2000; BVP 2003]
Due to mutual repulsion of charges distributed on the surface of bubble.
When a wire loop is rotated in a magnetic field, the direction of induced emf change by?
When a wire loop is rotated in a magnetic field, the direction of induced emf changes for every 1/2 rotation.... View Article
Aray is reflected in turn by three plain mirrors mutually at right angles to each other. The angle between the incident and the reflected rays is
Ray after reflection from three mutually perpendicular mirrors becomes anti- parallel.
Light waves can be polarized as they are
Light waves can be polarized because these waves are transverse in nature. When the waves are transverse in nature, the... View Article
The majority charge carriers in P-type semiconductor are [MP PMT1999; CBSE PMT 1999; MP PET 1991; MP PET/PMT 1998; MH CET 2003]
In P-type semiconductors, holes are the majority charge carriers
The electric field inside a spherical shell of uniform surface charge density is____
Answer: The electric field inside a spherical shell of uniform surface charge density is zero. All charge resides on the... View Article
1.[CPMT 1975, 91, 2001; NCERT 1980, 83; EAMCET 1994; MP PET 1995; MNR 1998; Pb. PMT 2000]
The force is perpendicular to the displacement.
The occurrence of earthquakes can be predicted precisely using the latest technology.
No, the occurrence of earthquakes cannot be predicted precisely. Buildings that are constructed in an earthquake prone area should be... View Article
In a crystal, the atoms arelocated at the position of [AMU 1985]
The sodium chloride crystal structure has a fcc lattice with one chloride ion at each lattice point and one sodium... View Article
A magnet is brought towards acoil (i) speedly (ii) slowly then the induced e.m.f./induced charge will be respectively [RPMT 1997; MP PMT 2003]
The magnitude of induced e.m.f. is directly proportional to the rate of change of magnetic flux. Induced charge doesn’t depend... View Article
Find the photoelectric current in the given scenario
An image of the sun is formed by a lens of the focal length of 30 cm on the metal... View Article
The news says that there was a 7.5 Richter scale in Nepal, you also recall an earthquake some years earlier in your hometown of 6 Richer scale. Which of the following would be true?
The power of an earthquake is expressed in terms of magnitude on a scale called Richter scale.
What is the magnitude of the gravitational force exerted by a 15Kg mass on a 25Kg mass separated by a distance of 25cm. What is the acceleration produced in each mass?
Let the masses of 2 bodies be m1 and m2 and let their accelerations be a1 and a2 respectively. Distance... View Article
The expectedenergy of the electrons at absolute zero is called [RPET 1996]
The highest energy level which an electron can occupy in the valence band at 0 K, is called Fermi energy... View Article
Lenz’s law isconsequence of the law of conservation of [JIPMER 1997; CPMT 1990; RPMT 1997; MP PET 1999; MP PMT 2000, 03; RPET 2003; AFMC 2004]
Lenz’s law is a consequence of the law of conservation of energy. Lenz’s law Lenz’s law states that induced electromotive... View Article
A star emits light of 5500 Å wavelength. Its appearsblue to an observer on the earth, it means[DPMT 2002]
Blue radiations have the wavelength around 4600Å. It shows that apparent wavelength is smaller than the real wavelength. It means... View Article
Earthquakes cause Tsunamis but Tsunamis do not cause earthquakes.
Tremors displace large amounts of water and this leads to Tsunami. But a Tsunami does not cause an earthquake as... View Article
The nature ofbinding for a crystal with alternate and evenly spaced positive and negative ions is [CBSE PMT 2000]
Ionic bonds cone into being when atoms that have low ionization energies, and hence lose electrons rapidly, interact with other... View Article
The energy levels of the hydrogen spectrumis shown in figure.some transitions A, B, C, D and E. Transition A, B and C respectively represent [CPMT 1986, 88]
Transition A (n = ¥ to 1) : Series limit of Lyman series Transition B (n = 5 to n... View Article
