NEET 2009 Question Paper with Solutions

A body of mass 1 kg is thrown upwards with a velocity 20 m/s. It momentarily comes to rest after attaining a height of 18 m. How much energy is lost due to air friction? (g = 10 \(\text{m/s}^2\))

A particle starts its motion from rest under the action of a constant force. If the distance covered in first 10 seconds is \(S_1\) and that covered in the first 20 seconds is \(S_2\), then

Which one of the following equations of motion represents simple harmonic motion? where k, \(k_0\), \(k_1\) and a are all positive.

A simple pendulum performs simple harmonic motion about x = 0 with an amplitude a and time period T. The speed of the pendulum at x = a/2 will be

If the dimensions of a physical quantity are given by \(M^aL^bT^c\), then the physical quantity will be

From the following bond energies: H-H bond energy: \(431.37\ \text{kJ mol}^{-1}\); C=C bond energy: \(606.10\ \text{kJ mol}^{-1}\); C-C bond energy: \(336.49\ \text{kJ mol}^{-1}\); C-H bond energy: \(410.50\ \text{kJ mol}^{-1}\). Enthalpy for the reaction will be

In the case of alkali metals, the covalent character decreases in the order

Which of the following is not permissible arrangement of electrons in an atom?

The dissociation constants for acetic acid and HCN at \(25^\circ C\) are \(1.5\times10^{-5}\) and \(4.5\times10^{-10}\) respectively. The equilibrium constant for the equilibrium \(CN^-+CH_3COOH\rightleftharpoons HCN+CH_3COO^-\) would be

In which of the following molecules/ions \(BF_3\), \(NO_2^-\), \(NH_2^-\) and \(H_2O\), the central atom is \(sp^2\) hybridised?

Three capacitors each of capacitance C and of breakdown voltage V are joined in series. The capacitance and breakdown voltages of the combination will be

A transistor is operated in common-emitter configuration at \(V_C=2\ \text{V}\) such that a change in the base current from \(100\ \mu A\) to \(200\ \mu A\) produces a change in the collector current from 5 mA to 10 mA. The current gain is

If a diamagnetic substance is brought near the north or the south pole of a bar magnet, it is

The mean free path of electrons in a metal is \(4\times10^{-8}\) m. The electric field which can give on an average 2 eV energy to an electron in the metal will be in units V/m

A p-n photodiode is fabricated from a semiconductor with a band gap of 2.5 eV. It can detect a signal of wavelength

The straight chain polymer is formed by

Which of the following does not show optical isomerism? (en = ethylenediamine)

Predict the product.

Consider the following reaction: the product Z is

\(Al_2O_3\) is reduced by electrolysis at low potentials and high currents. If \(4.0\times10^4\) amperes of current is passed through molten \(Al_2O_3\) for 6 hours, what mass of aluminium is produced? (Assume 100% current efficiency, at mass of Al = 27 g mol\(^{-1}\)).